diff --git a/app/src/main/java/io/heckel/ntfy/up/BroadcastReceiver.kt b/app/src/main/java/io/heckel/ntfy/up/BroadcastReceiver.kt
index 339b772..43cfe09 100644
--- a/app/src/main/java/io/heckel/ntfy/up/BroadcastReceiver.kt
+++ b/app/src/main/java/io/heckel/ntfy/up/BroadcastReceiver.kt
@@ -5,8 +5,8 @@ import android.content.Intent
 import io.heckel.ntfy.R
 import io.heckel.ntfy.app.Application
 import io.heckel.ntfy.db.Subscription
-import io.heckel.ntfy.util.Log
 import io.heckel.ntfy.service.SubscriberServiceManager
+import io.heckel.ntfy.util.Log
 import io.heckel.ntfy.util.randomString
 import io.heckel.ntfy.util.topicUrlUp
 import kotlinx.coroutines.Dispatchers
@@ -40,7 +40,7 @@ class BroadcastReceiver : android.content.BroadcastReceiver() {
         Log.d(TAG, "REGISTER received for app $appId (connectorToken=$connectorToken)")
         if (appId.isBlank()) {
             Log.w(TAG, "Refusing registration: Empty application")
-            distributor.sendRegistrationRefused(appId, connectorToken)
+            distributor.sendRegistrationFailed(appId, connectorToken, "Empty application string")
             return
         }
         GlobalScope.launch(Dispatchers.IO) {
@@ -52,7 +52,7 @@ class BroadcastReceiver : android.content.BroadcastReceiver() {
                     distributor.sendEndpoint(appId, connectorToken, endpoint)
                 } else {
                     Log.d(TAG, "Subscription with connectorToken $connectorToken exists for a different app. Refusing registration.")
-                    distributor.sendRegistrationRefused(appId, connectorToken)
+                    distributor.sendRegistrationFailed(appId, connectorToken, "Connector token already exists")
                 }
                 return@launch
             }
@@ -74,11 +74,17 @@ class BroadcastReceiver : android.content.BroadcastReceiver() {
                 lastActive = Date().time/1000
             )
             Log.d(TAG, "Adding subscription with for app $appId (connectorToken $connectorToken): $subscription")
-            repository.addSubscription(subscription)
-            distributor.sendEndpoint(appId, connectorToken, endpoint)
+            try {
+                // Note, this may fail due to a SQL constraint exception, see https://github.com/binwiederhier/ntfy/issues/185
+                repository.addSubscription(subscription)
+                distributor.sendEndpoint(appId, connectorToken, endpoint)
 
-            // Refresh (and maybe start) foreground service
-            SubscriberServiceManager.refresh(app)
+                // Refresh (and maybe start) foreground service
+                SubscriberServiceManager.refresh(app)
+            } catch (e: Exception) {
+                Log.w(TAG, "Failed to add subscription", e)
+                distributor.sendRegistrationFailed(appId, connectorToken, e.message)
+            }
         }
     }
 
diff --git a/app/src/main/java/io/heckel/ntfy/up/Constants.kt b/app/src/main/java/io/heckel/ntfy/up/Constants.kt
index 8c9ddaf..ab9c816 100644
--- a/app/src/main/java/io/heckel/ntfy/up/Constants.kt
+++ b/app/src/main/java/io/heckel/ntfy/up/Constants.kt
@@ -6,7 +6,7 @@ package io.heckel.ntfy.up
  */
 
 const val ACTION_NEW_ENDPOINT = "org.unifiedpush.android.connector.NEW_ENDPOINT"
-const val ACTION_REGISTRATION_REFUSED = "org.unifiedpush.android.connector.REGISTRATION_REFUSED"
+const val ACTION_REGISTRATION_FAILED = "org.unifiedpush.android.connector.REGISTRATION_FAILED"
 const val ACTION_UNREGISTERED = "org.unifiedpush.android.connector.UNREGISTERED"
 const val ACTION_MESSAGE = "org.unifiedpush.android.connector.MESSAGE"
 
diff --git a/app/src/main/java/io/heckel/ntfy/up/Distributor.kt b/app/src/main/java/io/heckel/ntfy/up/Distributor.kt
index 1e9b7c1..5a11d6b 100644
--- a/app/src/main/java/io/heckel/ntfy/up/Distributor.kt
+++ b/app/src/main/java/io/heckel/ntfy/up/Distributor.kt
@@ -39,12 +39,15 @@ class Distributor(val context: Context) {
         context.sendBroadcast(broadcastIntent)
     }
 
-    fun sendRegistrationRefused(app: String, connectorToken: String) {
-        Log.d(TAG, "Sending REGISTRATION_REFUSED to $app (token=$connectorToken)")
+    fun sendRegistrationFailed(app: String, connectorToken: String, message: String?) {
+        Log.d(TAG, "Sending REGISTRATION_FAILED to $app (token=$connectorToken)")
         val broadcastIntent = Intent()
         broadcastIntent.`package` = app
-        broadcastIntent.action = ACTION_REGISTRATION_REFUSED
+        broadcastIntent.action = ACTION_REGISTRATION_FAILED
         broadcastIntent.putExtra(EXTRA_TOKEN, connectorToken)
+        if (message != null) {
+            broadcastIntent.putExtra(EXTRA_MESSAGE, message)
+        }
         context.sendBroadcast(broadcastIntent)
     }
 
diff --git a/fastlane/metadata/android/en-US/changelog/25.txt b/fastlane/metadata/android/en-US/changelog/25.txt
index 18a2d91..beb63f8 100644
--- a/fastlane/metadata/android/en-US/changelog/25.txt
+++ b/fastlane/metadata/android/en-US/changelog/25.txt
@@ -4,6 +4,7 @@ Features:
 
 Bugs:
 * IllegalStateException: Failed to build unique file (#177, thanks to @Fallenbagel for reporting)
+* SQLiteConstraintException: Crash during UP registration (#185)
 
 Thanks:
 * Many thanks to @cmeis, @Fallenbagel, @J117 and @rogeliodh for input on the new attachment logic, and for