diff --git a/app/src/main/java/jp/juggler/subwaytooter/ActAccountSetting.kt b/app/src/main/java/jp/juggler/subwaytooter/ActAccountSetting.kt
index 4b1a0e8e..c19cd98b 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/ActAccountSetting.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/ActAccountSetting.kt
@@ -1444,7 +1444,7 @@ class ActAccountSetting
 			}
 			
 			override fun onPostExecute(opener : InputStreamOpener?) {
-				progress.dismiss()
+				progress.dismissSafe()
 				if(opener != null) {
 					updateCredential(
 						when(request_code) {
diff --git a/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.kt b/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.kt
index f886be6d..6d95a222 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.kt
@@ -230,7 +230,7 @@ class ActAppSetting : AppCompatActivity() {
 			}
 			
 			override fun onPostExecute(result : File?) {
-				progress.dismiss()
+				progress.dismissSafe()
 				
 				if(isCancelled || result == null) {
 					// cancelled.
diff --git a/app/src/main/java/jp/juggler/subwaytooter/ActHighlightWordList.kt b/app/src/main/java/jp/juggler/subwaytooter/ActHighlightWordList.kt
index 2c8d3664..abba3c7f 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/ActHighlightWordList.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/ActHighlightWordList.kt
@@ -242,12 +242,7 @@ class ActHighlightWordList : AppCompatActivity(), View.OnClickListener {
 				}
 				edit(item)
 				
-				try {
-					dialog.dismiss()
-				} catch(ignored : Throwable) {
-				
-				}
-				
+				dialog.dismissSafe()
 			}
 		})
 	}
diff --git a/app/src/main/java/jp/juggler/subwaytooter/ActMain.kt b/app/src/main/java/jp/juggler/subwaytooter/ActMain.kt
index b46998ee..ef370c50 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/ActMain.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/ActMain.kt
@@ -2052,18 +2052,8 @@ class ActMain : AppCompatActivity()
 			override fun handleResult(result : TootApiResult?) {
 				
 				if(afterAccountVerify(result, ta, sa, host)) {
-					try {
-						dialog_host?.dismiss()
-					} catch(ignored : Throwable) {
-						// IllegalArgumentException がたまに出る
-					}
-					
-					try {
-						dialog_token?.dismiss()
-					} catch(ignored : Throwable) {
-						// IllegalArgumentException がたまに出る
-					}
-					
+					dialog_host?.dismissSafe()
+					dialog_token?.dismissSafe()
 				}
 			}
 		})
@@ -2750,7 +2740,7 @@ class ActMain : AppCompatActivity()
 			
 			override fun onPostExecute(result : ArrayList<Column>?) {
 				
-				progress.dismiss()
+				progress.dismissSafe()
 				
 				try {
 					window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
diff --git a/app/src/main/java/jp/juggler/subwaytooter/ActPost.kt b/app/src/main/java/jp/juggler/subwaytooter/ActPost.kt
index ce6cfe77..1026e647 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/ActPost.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/ActPost.kt
@@ -1500,10 +1500,7 @@ class ActPost : AppCompatActivity(),
 					pa.attachment = new_attachment
 					showMediaAttachment()
 					
-					try {
-						dialog.dismiss()
-					} catch(ignored : Throwable) {
-					}
+					dialog.dismissSafe()
 					
 				} else {
 					showToast(this@ActPost, true, result.error)
@@ -2439,7 +2436,7 @@ class ActPost : AppCompatActivity(),
 			}
 			
 			override fun onPostExecute(result : String?) {
-				progress.dismiss()
+				progress.dismissSafe()
 				
 				if(isCancelled || result == null) {
 					// cancelled.
diff --git a/app/src/main/java/jp/juggler/subwaytooter/DlgContextMenu.kt b/app/src/main/java/jp/juggler/subwaytooter/DlgContextMenu.kt
index d99ba52f..0a399745 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/DlgContextMenu.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/DlgContextMenu.kt
@@ -218,11 +218,7 @@ internal class DlgContextMenu(
 					b.text = caption
 					b.allCaps = false
 					b.setOnClickListener {
-						try {
-							dialog.dismiss()
-						} catch(ignored : Throwable) {
-							// IllegalArgumentException がたまに出る
-						}
+						dialog.dismissSafe()
 						span.onClick(contentTextView)
 					}
 					llLinks.addView(b, insPos ++)
@@ -445,12 +441,7 @@ internal class DlgContextMenu(
 	}
 	
 	override fun onClick(v : View) {
-		
-		try {
-			dialog.dismiss()
-		} catch(ignored : Throwable) {
-			// IllegalArgumentException がたまに出る
-		}
+		dialog.dismissSafe()
 		
 		val pos = activity.nextPosition(column)
 		
@@ -870,11 +861,7 @@ internal class DlgContextMenu(
 		
 		when(v.id) {
 			R.id.btnFollow -> {
-				try {
-					dialog.dismiss()
-				} catch(ignored : Throwable) {
-					// IllegalArgumentException がたまに出る
-				}
+				dialog.dismissSafe()
 				Action_Follow.followFromAnotherAccount(
 					activity,
 					activity.nextPosition(column),
diff --git a/app/src/main/java/jp/juggler/subwaytooter/action/Action_Account.kt b/app/src/main/java/jp/juggler/subwaytooter/action/Action_Account.kt
index e50f8856..4f1133f5 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/action/Action_Account.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/action/Action_Account.kt
@@ -46,14 +46,10 @@ object Action_Account {
 					val data = result.data
 					if(data is String) {
 						// ブラウザ用URLが生成された
-						try {
-							val intent = Intent()
-							intent.data = data.toUri()
-							activity.startAccessTokenUpdate(intent)
-							dialog.dismiss()
-						} catch(ignored : Throwable) {
-							// IllegalArgumentException がたまに出る
-						}
+						val intent = Intent()
+						intent.data = data.toUri()
+						activity.startAccessTokenUpdate(intent)
+						dialog.dismissSafe()
 					} else if(data is JSONObject) {
 						// インスタンスを確認できた
 						when(action) {
@@ -94,9 +90,9 @@ object Action_Account {
 								showToast(activity, false, R.string.server_confirmed)
 								val pos = App1.getAppState(activity).column_list.size
 								activity.addColumn(pos, a, Column.TYPE_LOCAL)
+								dialog.dismissSafe()
 								
 								try {
-									dialog.dismiss()
 								} catch(ignored : Throwable) {
 									// IllegalArgumentException がたまに出る
 								}
@@ -189,16 +185,8 @@ object Action_Account {
 				override fun handleResult(result : TootApiResult?) {
 					val sa : SavedAccount? = null
 					if(activity.afterAccountVerify(result, ta, sa, instance)) {
-						try {
-							dialog_host.dismiss()
-						} catch(ignored : Throwable) {
-							// IllegalArgumentException がたまに出る
-						}
-						try {
-							dialog_create.dismiss()
-						} catch(ignored : Throwable) {
-							// IllegalArgumentException がたまに出る
-						}
+						dialog_host.dismissSafe()
+						dialog_create.dismissSafe()
 					}
 				}
 			})
diff --git a/app/src/main/java/jp/juggler/subwaytooter/action/Action_List.kt b/app/src/main/java/jp/juggler/subwaytooter/action/Action_List.kt
index 9abf19f7..982a2ff9 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/action/Action_List.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/action/Action_List.kt
@@ -9,6 +9,7 @@ import jp.juggler.subwaytooter.api.entity.parseItem
 import jp.juggler.subwaytooter.dialog.DlgConfirm
 import jp.juggler.subwaytooter.dialog.DlgTextInput
 import jp.juggler.subwaytooter.table.SavedAccount
+import jp.juggler.util.dismissSafe
 import jp.juggler.util.showToast
 import jp.juggler.util.toPostRequestBuilder
 import jp.juggler.util.toPutRequestBuilder
@@ -176,11 +177,7 @@ object Action_List {
 								for(column in activity.app_state.column_list) {
 									column.onListNameUpdated(access_info, list)
 								}
-								try {
-									dialog.dismiss()
-								} catch(ignored : Throwable) {
-								
-								}
+								dialog.dismissSafe()
 							} else {
 								showToast(activity, false, result.error)
 							}
diff --git a/app/src/main/java/jp/juggler/subwaytooter/action/Action_User.kt b/app/src/main/java/jp/juggler/subwaytooter/action/Action_User.kt
index 8b98dc5b..73fcd7c5 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/action/Action_User.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/action/Action_User.kt
@@ -443,11 +443,7 @@ object Action_User {
 		ReportForm.showReportForm(activity, access_info, who, status) { dialog, comment, forward ->
 			report(activity, access_info, who, status, comment, forward) {
 				// 成功したらダイアログを閉じる
-				try {
-					dialog.dismiss()
-				} catch(ignored : Throwable) {
-					// IllegalArgumentException がたまに出る
-				}
+				dialog.dismissSafe()
 			}
 		}
 	}
diff --git a/app/src/main/java/jp/juggler/subwaytooter/api/TootTaskRunner.kt b/app/src/main/java/jp/juggler/subwaytooter/api/TootTaskRunner.kt
index e60aa12c..817acb6d 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/api/TootTaskRunner.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/api/TootTaskRunner.kt
@@ -12,6 +12,7 @@ import java.text.NumberFormat
 import jp.juggler.subwaytooter.App1
 import jp.juggler.subwaytooter.dialog.ProgressDialogEx
 import jp.juggler.subwaytooter.table.SavedAccount
+import jp.juggler.util.dismissSafe
 
 /*
 	非同期タスク(TootTask)を実行します。
@@ -180,7 +181,7 @@ class TootTaskRunner(
 	
 	// ダイアログを閉じる
 	private fun dismissProgress() {
-		progress?.dismiss()
+		progress?.dismissSafe()
 		progress = null
 	}
 	
diff --git a/app/src/main/java/jp/juggler/subwaytooter/dialog/AccountPicker.kt b/app/src/main/java/jp/juggler/subwaytooter/dialog/AccountPicker.kt
index 3a98cb49..e06d8f5b 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/dialog/AccountPicker.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/dialog/AccountPicker.kt
@@ -13,6 +13,7 @@ import jp.juggler.subwaytooter.table.AcctColor
 import jp.juggler.subwaytooter.table.SavedAccount
 import jp.juggler.subwaytooter.util.DialogInterfaceCallback
 import jp.juggler.subwaytooter.util.SavedAccountCallback
+import jp.juggler.util.dismissSafe
 import jp.juggler.util.showToast
 import java.util.*
 import java.util.concurrent.atomic.AtomicBoolean
@@ -144,7 +145,7 @@ object AccountPicker {
 			b.setOnClickListener {
 				isDialogClosed.set(true)
 				callback(a)
-				dialog.dismiss()
+				dialog.dismissSafe()
 			}
 			llAccounts.addView(b)
 		}
diff --git a/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgDateTime.kt b/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgDateTime.kt
index 4e943638..26e84751 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgDateTime.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgDateTime.kt
@@ -13,6 +13,7 @@ import android.widget.TimePicker
 import jp.juggler.subwaytooter.R
 import java.util.*
 import android.provider.Settings.System.TIME_12_24
+import jp.juggler.util.dismissSafe
 
 class DlgDateTime(
 	val activity : Activity
@@ -84,7 +85,7 @@ class DlgDateTime(
 			R.id.btnCancel -> dialog.cancel()
 			
 			R.id.btnOk -> {
-				dialog.dismiss()
+				dialog.dismissSafe()
 				callback(getTime())
 			}
 		}
diff --git a/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgDraftPicker.kt b/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgDraftPicker.kt
index 12e584b6..6a9e4fac 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgDraftPicker.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgDraftPicker.kt
@@ -16,6 +16,7 @@ import jp.juggler.subwaytooter.App1
 import jp.juggler.subwaytooter.R
 import jp.juggler.subwaytooter.api.entity.TootStatus
 import jp.juggler.subwaytooter.table.PostDraft
+import jp.juggler.util.dismissSafe
 import jp.juggler.util.showToast
 import org.json.JSONObject
 
@@ -36,7 +37,7 @@ class DlgDraftPicker : AdapterView.OnItemClickListener, AdapterView.OnItemLongCl
 		val json = getPostDraft(position)?.json
 		if(json != null) {
 			callback(json)
-			dialog.dismiss()
+			dialog.dismissSafe()
 		}
 	}
 	
diff --git a/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgFocusPoint.kt b/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgFocusPoint.kt
index f4d5634d..b4bd4521 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgFocusPoint.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgFocusPoint.kt
@@ -15,6 +15,7 @@ import jp.juggler.subwaytooter.api.TootTaskRunner
 import jp.juggler.subwaytooter.api.entity.TootAttachment
 import jp.juggler.subwaytooter.view.FocusPointView
 import jp.juggler.util.LogCategory
+import jp.juggler.util.dismissSafe
 import jp.juggler.util.showToast
 import jp.juggler.util.withCaption
 
@@ -44,7 +45,7 @@ class DlgFocusPoint(val activity : Activity, val attachment : TootAttachment) :
 	
 	override fun onClick(v : View) {
 		when(v.id) {
-			R.id.btnClose -> dialog.dismiss()
+			R.id.btnClose -> dialog.dismissSafe()
 		}
 	}
 	
@@ -105,21 +106,13 @@ class DlgFocusPoint(val activity : Activity, val attachment : TootAttachment) :
 				val bitmap = this.bitmap
 				if(bitmap == null) {
 					showToast(activity, true, result?.error ?: "?")
-					try {
-						dialog.dismiss()
-					} catch(ignored : Throwable) {
-					
-					}
+					dialog.dismissSafe()
 					return
 				}
 				
 				if(activity.isFinishing) {
 					bitmap.recycle()
-					try {
-						dialog.dismiss()
-					} catch(ignored : Throwable) {
-					
-					}
+					dialog.dismissSafe()
 					return
 				}
 				
diff --git a/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgListMember.kt b/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgListMember.kt
index 2985b248..063d4df9 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgListMember.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgListMember.kt
@@ -15,16 +15,19 @@ import jp.juggler.subwaytooter.action.Action_List
 import jp.juggler.subwaytooter.action.Action_ListMember
 import jp.juggler.subwaytooter.action.makeAccountListNonPseudo
 import jp.juggler.subwaytooter.api.*
-import jp.juggler.subwaytooter.api.entity.*
+import jp.juggler.subwaytooter.api.entity.EntityId
+import jp.juggler.subwaytooter.api.entity.TootAccount
+import jp.juggler.subwaytooter.api.entity.TootList
+import jp.juggler.subwaytooter.api.entity.parseList
 import jp.juggler.subwaytooter.table.AcctColor
 import jp.juggler.subwaytooter.table.SavedAccount
 import jp.juggler.subwaytooter.util.NetworkEmojiInvalidator
 import jp.juggler.subwaytooter.view.MyListView
 import jp.juggler.subwaytooter.view.MyNetworkImageView
+import jp.juggler.util.dismissSafe
 import jp.juggler.util.getAttributeColor
 import jp.juggler.util.showToast
 import jp.juggler.util.toPostRequestBuilder
-import org.json.JSONObject
 import java.util.*
 
 @SuppressLint("InflateParams")
@@ -51,10 +54,10 @@ class DlgListMember(
 		this.account_list = makeAccountListNonPseudo(activity, null)
 		this.target_user_full_acct = _list_owner.getFullAcct(who)
 		
-		if(_list_owner.isPseudo) {
-			this.list_owner = null
+		this.list_owner = if(_list_owner.isPseudo) {
+			null
 		} else {
-			this.list_owner = _list_owner
+			_list_owner
 		}
 		
 		val view = activity.layoutInflater.inflate(R.layout.dlg_list_member, null, false)
@@ -73,7 +76,12 @@ class DlgListMember(
 		btnListOwner.setOnClickListener(this)
 		view.findViewById<View>(R.id.btnClose).setOnClickListener(this)
 		
-		ivUser.setImageUrl(App1.pref, 	Styler.calcIconRound(ivUser.layoutParams), who.avatar_static, who.avatar)
+		ivUser.setImageUrl(
+			App1.pref,
+			Styler.calcIconRound(ivUser.layoutParams),
+			who.avatar_static,
+			who.avatar
+		)
 		val user_name_invalidator = NetworkEmojiInvalidator(activity.handler, tvUserName)
 		val name = who.decodeDisplayName(activity)
 		tvUserName.text = name
@@ -82,35 +90,32 @@ class DlgListMember(
 		
 		setListOwner(list_owner)
 		
-		this.dialog = Dialog(activity)
-		
-		val w = dialog.window
-		if(w != null) {
-			w.setFlags(0, Window.FEATURE_NO_TITLE)
-			w.setLayout(
-				WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT
-			)
+		dialog = Dialog(activity).apply{
+			window?.apply{
+				setFlags(0, Window.FEATURE_NO_TITLE)
+				setLayout(
+					WindowManager.LayoutParams.MATCH_PARENT,
+					WindowManager.LayoutParams.MATCH_PARENT
+				)
+			}
+			setTitle(R.string.your_lists)
+			setContentView(view)
 		}
 		
-		dialog.setTitle(R.string.your_lists)
-		dialog.setContentView(view)
 	}
 	
-	fun show() {
-		val w = dialog.window
-		w?.setLayout(
-			WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT
+	fun show() = dialog.apply{
+		window?.setLayout(
+			WindowManager.LayoutParams.MATCH_PARENT,
+			WindowManager.LayoutParams.MATCH_PARENT
 		)
-		dialog.show()
+		show()
 	}
 	
 	override fun onClick(v : View) {
 		when(v.id) {
 			
-			R.id.btnClose -> try {
-				dialog.dismiss()
-			} catch(ignored : Throwable) {
-			}
+			R.id.btnClose -> dialog.dismissSafe()
 			
 			R.id.btnListOwner -> {
 				AccountPicker.pick(
@@ -152,7 +157,12 @@ class DlgListMember(
 			if(AcctColor.hasColorForeground(ac)) {
 				btnListOwner.setTextColor(ac.color_fg)
 			} else {
-				btnListOwner.setTextColor(getAttributeColor(activity, android.R.attr.textColorPrimary))
+				btnListOwner.setTextColor(
+					getAttributeColor(
+						activity,
+						android.R.attr.textColorPrimary
+					)
+				)
 			}
 		}
 		
@@ -168,54 +178,71 @@ class DlgListMember(
 			return
 		}
 		
-		TootTaskRunner(activity).run(list_owner , object : TootTask {
+		TootTaskRunner(activity).run(list_owner, object : TootTask {
 			
 			var new_list : ArrayList<TootList>? = null
 			
 			override fun background(client : TootApiClient) : TootApiResult? {
-
+				
 				// リストに追加したいアカウントの自タンスでのアカウントIDを取得する
-				var (result,ar) = client.syncAccountByAcct(list_owner,target_user_full_acct)
-				val local_who = ar?.get() ?: return result
+				val (r1, ar) = client.syncAccountByAcct(list_owner, target_user_full_acct)
+				val local_who = ar?.get() ?: return r1
 				
 				this@DlgListMember.local_who = local_who
 				
-				if(list_owner.isMisskey){
+				return if(list_owner.isMisskey) {
 					// 今のmisskeyではリスト全スキャンしないとユーザの登録状況が分からない
-					val params = list_owner.putMisskeyApiToken(JSONObject())
-					result = client.request("/api/users/lists/list",params.toPostRequestBuilder())
-					val jsonArray = result?.jsonArray ?:return result
-					this.new_list = parseList(::TootList,TootParser(activity,list_owner),jsonArray)
-					this.new_list?.forEach { list->
-						list.isRegistered = null != list.userIds?.find { it == local_who.id }
+					client.request(
+						"/api/users/lists/list",
+						list_owner
+							.putMisskeyApiToken()
+							.toPostRequestBuilder()
+					)?.also { result ->
+						this.new_list = parseList(
+							::TootList,
+							TootParser(activity, list_owner),
+							result.jsonArray ?: return@also
+						).apply {
+							forEach { list ->
+								list.isRegistered =
+									null != list.userIds?.find { it == local_who.id }
+							}
+						}
 					}
-				}else{
-					// リスト登録状況を取得
-					result = client.request("/api/v1/accounts/" + local_who .id + "/lists")
-					var jsonArray = result?.jsonArray ?:return result
+				} else {
 					
-					// 結果を解釈する
 					val set_registered = HashSet<EntityId>()
-					for(a in parseList(::TootList,TootParser(activity,list_owner),jsonArray)) {
-						set_registered.add(a.id)
+					
+					// メンバーを指定してリスト登録状況を取得
+					client.request(
+						"/api/v1/accounts/${local_who.id}/lists"
+					)?.also { result ->
+						val jsonArray = result.jsonArray ?: return result
+						parseList(
+							::TootList,
+							TootParser(activity, list_owner),
+							jsonArray
+						).forEach {
+							set_registered.add(it.id)
+						}
 					}
 					
 					// リスト一覧を取得
-					result = client.request("/api/v1/lists")
-					jsonArray = result?.jsonArray ?: return result
-					
-					val new_list = parseList(::TootList,TootParser(activity,list_owner),jsonArray)
-					new_list.sort()
-					
-					this.new_list = new_list
-					
-					// isRegistered を設定する
-					for(a in new_list) {
-						if(set_registered.contains(a.id)) a.isRegistered = true
+					client.request("/api/v1/lists")?.also { result ->
+						this.new_list = parseList(
+							::TootList,
+							TootParser(activity, list_owner),
+							result.jsonArray ?: return@also
+						).apply {
+							
+							sort()
+							
+							forEach {
+								it.isRegistered = set_registered.contains(it.id)
+							}
+						}
 					}
 				}
-				
-				return result
 			}
 			
 			override fun handleResult(result : TootApiResult?) {
@@ -224,7 +251,7 @@ class DlgListMember(
 				result ?: return // cancelled.
 				
 				val error = result.error
-				if( error?.isNotEmpty() == true && result.response?.code() == 404 ) {
+				if(error?.isNotEmpty() == true && result.response?.code() == 404) {
 					showToast(activity, true, result.error)
 				}
 				
@@ -245,34 +272,37 @@ class DlgListMember(
 	}
 	
 	private fun openListCreator() {
-		DlgTextInput.show(activity, activity.getString(R.string.list_create), null, object : DlgTextInput.Callback {
-			
-			override fun onEmptyError() {
-				showToast(activity, false, R.string.list_name_empty)
-			}
-			
-			override fun onOK(dialog : Dialog, text : String) {
-				val list_owner = this@DlgListMember.list_owner
-
-				if(list_owner == null) {
-					showToast(activity, false, "list owner is not selected.")
-					return
+		DlgTextInput.show(
+			activity,
+			activity.getString(R.string.list_create),
+			null,
+			object : DlgTextInput.Callback {
+				
+				override fun onEmptyError() {
+					showToast(activity, false, R.string.list_name_empty)
 				}
 				
-				Action_List.create(activity, list_owner , text, object : Action_List.CreateCallback {
-					override fun onCreated(list : TootList) {
-						try {
-							dialog.dismiss()
-						} catch(ignored : Throwable) {
-						}
-						
-						loadLists()
-						
+				override fun onOK(dialog : Dialog, text : String) {
+					val list_owner = this@DlgListMember.list_owner
+					
+					if(list_owner == null) {
+						showToast(activity, false, "list owner is not selected.")
+						return
 					}
-				})
-			}
-			
-		})
+					
+					Action_List.create(
+						activity,
+						list_owner,
+						text,
+						object : Action_List.CreateCallback {
+							override fun onCreated(list : TootList) {
+								dialog.dismissSafe()
+								loadLists()
+							}
+						})
+				}
+				
+			})
 	}
 	
 	internal class ErrorItem(val message : String)
@@ -302,7 +332,7 @@ class DlgListMember(
 		}
 		
 		override fun getView(position : Int, viewOld : View?, parent : ViewGroup) : View {
-			val view:View
+			val view : View
 			val o = getItem(position)
 			when(o) {
 				is TootList -> {
@@ -311,31 +341,44 @@ class DlgListMember(
 						view = viewOld
 						holder = view.tag as VH_List
 					} else {
-						view = activity.layoutInflater.inflate(R.layout.lv_list_member_list, parent, false)
+						view = activity.layoutInflater.inflate(
+							R.layout.lv_list_member_list,
+							parent,
+							false
+						)
 						holder = VH_List(view)
-						view .tag = holder
+						view.tag = holder
 					}
 					holder.bind(o)
 				}
+				
 				is ErrorItem -> {
 					val holder : VH_Error
 					if(viewOld != null) {
 						view = viewOld
 						holder = view.tag as VH_Error
 					} else {
-						view = activity.layoutInflater.inflate(R.layout.lv_list_member_error, parent, false)
+						view = activity.layoutInflater.inflate(
+							R.layout.lv_list_member_error,
+							parent,
+							false
+						)
 						holder = VH_Error(view)
-						view .tag = holder
+						view.tag = holder
 					}
 					holder.bind(o)
 				}
-				else -> view = activity.layoutInflater.inflate(R.layout.lv_list_member_error, parent, false)
+				
+				else -> view =
+					activity.layoutInflater.inflate(R.layout.lv_list_member_error, parent, false)
 			}
 			return view
 		}
 	}
 	
-	internal inner class VH_List(view : View) : CompoundButton.OnCheckedChangeListener, Action_ListMember.Callback {
+	internal inner class VH_List(view : View) : CompoundButton.OnCheckedChangeListener,
+		Action_ListMember.Callback {
+		
 		private val cbItem : CheckBox
 		private var bBusy : Boolean = false
 		var item : TootList? = null
@@ -347,11 +390,11 @@ class DlgListMember(
 		
 		fun bind(item : TootList) {
 			bBusy = true
-
+			
 			this.item = item
 			cbItem.text = item.title
 			cbItem.isChecked = item.isRegistered
-
+			
 			bBusy = false
 		}
 		
@@ -360,7 +403,7 @@ class DlgListMember(
 				// ユーザ操作以外で変更されたなら何もしない
 				return
 			}
-
+			
 			val list_owner = this@DlgListMember.list_owner
 			if(list_owner == null) {
 				showToast(activity, false, "list owner is not selected")
@@ -372,14 +415,14 @@ class DlgListMember(
 				showToast(activity, false, "target user is not synchronized")
 				return
 			}
-
-			val item = this.item ?:return
+			
+			val item = this.item ?: return
 			
 			// 状態をサーバに伝える
 			if(isChecked) {
-				Action_ListMember.add(activity, list_owner , item.id, local_who , callback =  this)
+				Action_ListMember.add(activity, list_owner, item.id, local_who, callback = this)
 			} else {
-				Action_ListMember.delete(activity, list_owner , item.id, local_who , this)
+				Action_ListMember.delete(activity, list_owner, item.id, local_who, this)
 			}
 		}
 		
@@ -392,11 +435,7 @@ class DlgListMember(
 	}
 	
 	internal inner class VH_Error(view : View) {
-		private val tvError : TextView
-		
-		init {
-			this.tvError = view.findViewById(R.id.tvError)
-		}
+		private val tvError : TextView = view.findViewById(R.id.tvError)
 		
 		fun bind(o : ErrorItem) {
 			this.tvError.text = o.message
diff --git a/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgQRCode.kt b/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgQRCode.kt
index 624250c0..a9073f99 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgQRCode.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/dialog/DlgQRCode.kt
@@ -11,6 +11,7 @@ import jp.juggler.subwaytooter.ActMain
 import jp.juggler.subwaytooter.App1
 import jp.juggler.subwaytooter.R
 import jp.juggler.util.LogCategory
+import jp.juggler.util.dismissSafe
 import jp.juggler.util.showToast
 import net.glxn.qrgen.android.QRCode
 
@@ -48,7 +49,7 @@ object DlgQRCode {
 			}
 			
 			override fun onPostExecute(result : Bitmap?) {
-				progress.dismiss()
+				progress.dismissSafe()
 				if(result != null) {
 					callback.onQrCode(result)
 				}
diff --git a/app/src/main/java/jp/juggler/subwaytooter/dialog/EmojiPicker.kt b/app/src/main/java/jp/juggler/subwaytooter/dialog/EmojiPicker.kt
index 70feb808..c3cfbfc2 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/dialog/EmojiPicker.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/dialog/EmojiPicker.kt
@@ -11,16 +11,8 @@ import android.view.View
 import android.view.ViewGroup
 import android.view.WindowManager
 import android.widget.*
-
 import com.astuetz.PagerSlidingTabStrip
 import jp.juggler.emoji.EmojiMap201709
-
-import org.json.JSONArray
-import org.json.JSONObject
-
-import java.util.ArrayList
-import java.util.HashMap
-
 import jp.juggler.subwaytooter.App1
 import jp.juggler.subwaytooter.Pref
 import jp.juggler.subwaytooter.R
@@ -28,9 +20,9 @@ import jp.juggler.subwaytooter.api.entity.CustomEmoji
 import jp.juggler.subwaytooter.put
 import jp.juggler.subwaytooter.view.MyViewPager
 import jp.juggler.subwaytooter.view.NetworkEmojiView
-import jp.juggler.util.LogCategory
-import jp.juggler.util.parseString
-import jp.juggler.util.toJsonArray
+import jp.juggler.util.*
+import org.json.JSONObject
+import java.util.*
 
 @SuppressLint("InflateParams")
 class EmojiPicker(
@@ -201,9 +193,9 @@ class EmojiPicker(
 		onPageSelected(0)
 		
 		// カスタム絵文字をロードする
-		if( instance != null && instance.isNotEmpty()) {
+		if(instance != null && instance.isNotEmpty()) {
 			setCustomEmojiList(
-				App1.custom_emoji_lister.getList(instance,isMisskey=isMisskey) {
+				App1.custom_emoji_lister.getList(instance, isMisskey = isMisskey) {
 					setCustomEmojiList(it) // ロード完了時に呼ばれる
 				}
 			)
@@ -246,11 +238,11 @@ class EmojiPicker(
 	}
 	
 	override fun onPageSelected(position : Int) {
-		try{
-			val hasSkinTone =page_list[position].hasSkinTone
+		try {
+			val hasSkinTone = page_list[position].hasSkinTone
 			val visibility = if(hasSkinTone) View.VISIBLE else View.INVISIBLE
 			ibSkinTone.forEach { it.visibility = visibility }
-		}catch(ex:Throwable){
+		} catch(ex : Throwable) {
 			log.trace(ex)
 		}
 	}
@@ -339,7 +331,7 @@ class EmojiPicker(
 	inner class EmojiPickerPageViewHolder(activity : Activity, root : View) : BaseAdapter(),
 		AdapterView.OnItemClickListener {
 		
-		val gridView : GridView
+		private val gridView : GridView
 		private val wh : Int
 		
 		private var page : EmojiPickerPage? = null
@@ -398,9 +390,9 @@ class EmojiPicker(
 				}
 				view.tag = item
 				if(view is ImageView) {
-					val name = if( page.hasSkinTone ){
+					val name = if(page.hasSkinTone) {
 						applySkinTone(item.name)
-					}else{
+					} else {
 						item.name
 					}
 					
@@ -438,14 +430,14 @@ class EmojiPicker(
 			} else {
 				// 普通の絵文字
 				EmojiMap201709.sShortNameToImageId[name] ?: return
-
-				if( page.hasSkinTone ){
+				
+				if(page.hasSkinTone) {
 					val sv = applySkinTone(name)
-					if(EmojiMap201709.sShortNameToImageId[sv]!=null){
-						name=sv
+					if(EmojiMap201709.sShortNameToImageId[sv] != null) {
+						name = sv
 					}
 				}
-
+				
 				selected(name, null)
 			}
 		}
@@ -455,32 +447,22 @@ class EmojiPicker(
 	// name はスキントーン適用済みであること
 	internal fun selected(name : String, instance : String?) {
 		
-		dialog.dismiss()
+		dialog.dismissSafe()
+		
+		val pref = App1.pref
 		
 		// Recentをロード(他インスタンスの絵文字を含む)
-		val pref = App1.pref
-		val list = ArrayList<JSONObject>()
-		val sv = Pref.spEmojiPickerRecent(pref)
-		if(sv.isNotEmpty()) {
-			try {
-				val array = sv.toJsonArray()
-				var i = 0
-				val ie = array.length()
-				while(i < ie) {
-					val item = array.optJSONObject(i)
-					if(item != null) list.add(item)
-					++ i
-				}
-			} catch(ex : Throwable) {
-				log.trace(ex)
-			}
+		val list = try {
+			Pref.spEmojiPickerRecent(pref).toJsonArray().toObjectList()
+		} catch(ignored : Throwable) {
+			ArrayList<JSONObject>()
 		}
 		
 		// 選択された絵文字と同じ項目を除去
 		// 項目が増えすぎたら減らす
 		run {
-			val it = list.iterator()
 			var nCount = 0
+			val it = list.iterator()
 			while(it.hasNext()) {
 				val item = it.next()
 				if(name == item.parseString("name")
@@ -494,21 +476,15 @@ class EmojiPicker(
 		}
 		
 		// 先頭に項目を追加
-		try {
-			val item = JSONObject()
-			item.put("name", name)
-			if(instance != null) item.put("instance", instance)
-			list.add(0, item)
-		} catch(ignored : Throwable) {
-		}
+		list.add(0, JSONObject().apply {
+			put("name", name)
+			if(instance != null) put("instance", instance)
+		})
 		
 		// 保存する
 		try {
-			val array = JSONArray()
-			for(item in list) {
-				array.put(item)
-			}
-			App1.pref.edit().put(Pref.spEmojiPickerRecent, array.toString()).apply()
+			val sv = list.toJsonArray().toString()
+			App1.pref.edit().put(Pref.spEmojiPickerRecent, sv).apply()
 		} catch(ignored : Throwable) {
 		
 		}
@@ -532,15 +508,15 @@ class EmojiPicker(
 		private fun Int.validPage() = this >= 0 && this < page_list.size
 		
 		private fun getPage(idx : Int) : EmojiPickerPage? {
-			return if(idx.validPage() ) page_list[idx] else null
+			return if(idx.validPage()) page_list[idx] else null
 		}
 		
 		fun getPageViewHolder(idx : Int) : EmojiPickerPageViewHolder? {
-			return if(idx.validPage() ) holder_list.get(idx) else null
+			return if(idx.validPage()) holder_list.get(idx) else null
 		}
 		
 		inline fun eachViewHolder(block : (Int, EmojiPickerPageViewHolder) -> Unit) {
-			for(i in 0 until page_list.size ){
+			for(i in 0 until page_list.size) {
 				val vh = holder_list.get(i) ?: continue
 				block(i, vh)
 			}
diff --git a/app/src/main/java/jp/juggler/subwaytooter/dialog/ProgressDialogEx.kt b/app/src/main/java/jp/juggler/subwaytooter/dialog/ProgressDialogEx.kt
index f553472c..c6afe707 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/dialog/ProgressDialogEx.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/dialog/ProgressDialogEx.kt
@@ -10,18 +10,4 @@ class ProgressDialogEx(context : Context) : ProgressDialog(context) {
 		const val STYLE_SPINNER = ProgressDialog.STYLE_SPINNER
 		const val STYLE_HORIZONTAL = ProgressDialog.STYLE_HORIZONTAL
 	}
-	
-	override fun dismiss() {
-		try {
-			super.dismiss()
-		} catch(ignored : Throwable) {
-			// java.lang.IllegalArgumentException:
-			// at android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:396)
-			// at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:322)
-			// at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:116)
-			// at android.app.Dialog.dismissDialog(Dialog.java:341)
-			// at android.app.Dialog.dismiss(Dialog.java:324)
-			
-		}
-	}
 }
diff --git a/app/src/main/java/jp/juggler/util/UiUtils.kt b/app/src/main/java/jp/juggler/util/UiUtils.kt
index 420160ea..52d22a47 100644
--- a/app/src/main/java/jp/juggler/util/UiUtils.kt
+++ b/app/src/main/java/jp/juggler/util/UiUtils.kt
@@ -1,8 +1,10 @@
 package jp.juggler.util
 
+import android.app.Dialog
 import android.content.ClipData
 import android.content.ClipboardManager
 import android.content.Context
+import android.content.DialogInterface
 import android.content.res.ColorStateList
 import android.graphics.Color
 import android.graphics.ColorFilter
@@ -272,3 +274,11 @@ fun CharSequence.copyToClipboard(context:Context) {
 	
 }
 
+
+fun DialogInterface.dismissSafe(){
+	try {
+		dismiss()
+	} catch(ignored : Throwable) {
+		// 非同期処理の後などではDialogがWindowTokenを失っている場合があり、IllegalArgumentException がたまに出る
+	}
+}