diff --git a/app/build.gradle b/app/build.gradle
index 60789fd5..18f8c4f4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -41,7 +41,7 @@ android {
 }
 
 dependencies {
-    implementation 'com.simplemobiletools:commons:3.18.17'
+    implementation 'com.simplemobiletools:commons:3.18.18'
     implementation 'com.facebook.stetho:stetho:1.5.0'
     implementation 'com.android.support.constraint:constraint-layout:1.0.2'
     implementation 'com.shawnlin:number-picker:2.4.6'
diff --git a/app/src/main/kotlin/com/simplemobiletools/clock/extensions/Context.kt b/app/src/main/kotlin/com/simplemobiletools/clock/extensions/Context.kt
index 2577f621..bc83cec5 100644
--- a/app/src/main/kotlin/com/simplemobiletools/clock/extensions/Context.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/clock/extensions/Context.kt
@@ -28,10 +28,7 @@ import com.simplemobiletools.clock.receivers.HideAlarmReceiver
 import com.simplemobiletools.clock.receivers.HideTimerReceiver
 import com.simplemobiletools.clock.services.SnoozeService
 import com.simplemobiletools.commons.extensions.*
-import com.simplemobiletools.commons.helpers.ALARM_SOUND_TYPE_ALARM
-import com.simplemobiletools.commons.helpers.isKitkatPlus
-import com.simplemobiletools.commons.helpers.isLollipopPlus
-import com.simplemobiletools.commons.helpers.isOreoPlus
+import com.simplemobiletools.commons.helpers.*
 import java.util.*
 import kotlin.math.pow
 
@@ -235,7 +232,13 @@ fun Context.getTimerNotification(pendingIntent: PendingIntent, addDeleteIntent:
         }
     }
 
-    grantReadUriPermission(config.timerSoundUri)
+    var uri = config.timerSoundUri
+    if (uri == SILENT) {
+        uri = ""
+    } else {
+        grantReadUriPermission(uri)
+    }
+
     val reminderActivityIntent = getReminderActivityIntent()
     val builder = NotificationCompat.Builder(this)
             .setContentTitle(getString(R.string.timer))
@@ -245,7 +248,7 @@ fun Context.getTimerNotification(pendingIntent: PendingIntent, addDeleteIntent:
             .setPriority(Notification.PRIORITY_HIGH)
             .setDefaults(Notification.DEFAULT_LIGHTS)
             .setAutoCancel(true)
-            .setSound(Uri.parse(config.timerSoundUri), AudioManager.STREAM_SYSTEM)
+            .setSound(Uri.parse(uri), AudioManager.STREAM_SYSTEM)
             .setChannelId(channelId)
             .addAction(R.drawable.ic_cross, getString(R.string.dismiss), if (addDeleteIntent) reminderActivityIntent else getHideTimerPendingIntent())
 
@@ -294,7 +297,13 @@ fun Context.getAlarmNotification(pendingIntent: PendingIntent, alarm: Alarm, add
         }
     }
 
-    grantReadUriPermission(alarm.soundUri)
+    var uri = alarm.soundUri
+    if (uri == SILENT) {
+        uri = ""
+    } else {
+        grantReadUriPermission(uri)
+    }
+
     val reminderActivityIntent = getReminderActivityIntent()
     val builder = NotificationCompat.Builder(this)
             .setContentTitle(label)
@@ -304,7 +313,7 @@ fun Context.getAlarmNotification(pendingIntent: PendingIntent, alarm: Alarm, add
             .setPriority(Notification.PRIORITY_HIGH)
             .setDefaults(Notification.DEFAULT_LIGHTS)
             .setAutoCancel(true)
-            .setSound(Uri.parse(alarm.soundUri), AudioManager.STREAM_ALARM)
+            .setSound(Uri.parse(uri), AudioManager.STREAM_ALARM)
             .setChannelId(channelId)
             .addAction(R.drawable.ic_cross, getString(R.string.dismiss), if (addDeleteIntent) reminderActivityIntent else getHideAlarmPendingIntent(alarm))
             .addAction(R.drawable.ic_snooze, getString(R.string.snooze), getSnoozePendingIntent(alarm, addDeleteIntent))
diff --git a/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Constants.kt b/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Constants.kt
index 13f9205a..31b4bf51 100644
--- a/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Constants.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Constants.kt
@@ -19,7 +19,6 @@ const val TABS_COUNT = 4
 const val EDITED_TIME_ZONE_SEPARATOR = ":"
 const val ALARM_ID = "alarm_id"
 const val DEFAULT_ALARM_MINUTES = 480
-const val DAY_MINUTES = 1440
 const val DEFAULT_MAX_ALARM_REMINDER_SECS = 300
 const val DEFAULT_MAX_TIMER_REMINDER_SECS = 60
 const val HIDE_REMINDER_ACTIVITY = "hide_reminder_activity"