diff --git a/CHANGES.md b/CHANGES.md
index 03817341bc..12ecb2e027 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -10,6 +10,7 @@ Improvements 🙌:
  - Support homeserver discovery from MXID (DISABLED: waiting for design) (#476)
 
 Bugfix 🐛:
+ - Fix | Verify Manually by Text crashes if private SSK not known (#1337)
  - Sometimes the same device appears twice in the list of devices of a user (#1329)
 
 Translations 🗣:
diff --git a/vector/src/main/java/im/vector/riotx/features/settings/devices/DevicesViewModel.kt b/vector/src/main/java/im/vector/riotx/features/settings/devices/DevicesViewModel.kt
index cd5e53b7c3..d0369e7707 100644
--- a/vector/src/main/java/im/vector/riotx/features/settings/devices/DevicesViewModel.kt
+++ b/vector/src/main/java/im/vector/riotx/features/settings/devices/DevicesViewModel.kt
@@ -30,7 +30,6 @@ import com.squareup.inject.assisted.Assisted
 import com.squareup.inject.assisted.AssistedInject
 import im.vector.matrix.android.api.MatrixCallback
 import im.vector.matrix.android.api.NoOpMatrixCallback
-import im.vector.matrix.android.api.extensions.tryThis
 import im.vector.matrix.android.api.failure.Failure
 import im.vector.matrix.android.api.session.Session
 import im.vector.matrix.android.api.session.crypto.verification.VerificationMethod
@@ -48,6 +47,7 @@ import io.reactivex.Observable
 import io.reactivex.functions.BiFunction
 import io.reactivex.subjects.PublishSubject
 import kotlinx.coroutines.launch
+import timber.log.Timber
 import java.util.concurrent.TimeUnit
 
 data class DevicesViewState(
@@ -65,6 +65,7 @@ data class DeviceFullInfo(
         val deviceInfo: DeviceInfo,
         val cryptoDeviceInfo: CryptoDeviceInfo?
 )
+
 class DevicesViewModel @AssistedInject constructor(
         @Assisted initialState: DevicesViewState,
         private val session: Session
@@ -215,8 +216,13 @@ class DevicesViewModel @AssistedInject constructor(
     private fun handleVerifyManually(action: DevicesAction.MarkAsManuallyVerified) = withState { state ->
         viewModelScope.launch {
             if (state.hasAccountCrossSigning) {
-                awaitCallback<Unit> {
-                    tryThis { session.cryptoService().crossSigningService().trustDevice(action.cryptoDeviceInfo.deviceId, it) }
+                try {
+                    awaitCallback<Unit> {
+                        session.cryptoService().crossSigningService().trustDevice(action.cryptoDeviceInfo.deviceId, it)
+                    }
+                } catch (failure: Throwable) {
+                    Timber.e("Failed to manually cross sign device ${action.cryptoDeviceInfo.deviceId} : ${failure.localizedMessage}")
+                    _viewEvents.post(DevicesViewEvents.Failure(failure))
                 }
             } else {
                 // legacy