OfflineFirstConversationsRepository#getRoom#onNext -> UndeliverableException

from gplay for 21.1.0 RC1

Exception io.reactivex.exceptions.UndeliverableException:
  at io.reactivex.plugins.RxJavaPlugins.onError (RxJavaPlugins.java:367)
  at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run (HandlerScheduler.java:126)
  at android.os.Handler.handleCallback (Handler.java:991)
  at android.os.Handler.dispatchMessage (Handler.java:102)
  at android.os.Looper.loopOnce (Looper.java:232)
  at android.os.Looper.loop (Looper.java:317)
  at android.app.ActivityThread.main (ActivityThread.java:8934)
  at java.lang.reflect.Method.invoke
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:591)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:911)
Caused by android.database.sqlite.SQLiteConstraintException: error code 19 (extended error code 0): not an error
  at net.sqlcipher.database.SQLiteStatement.native_execute
  at net.sqlcipher.database.SQLiteStatement.execute (SQLiteStatement.java:61)
  at androidx.room.driver.SupportSQLiteStatement$SupportOtherAndroidSQLiteStatement.step (SupportSQLiteStatement.android.kt:366)
  at androidx.room.EntityInsertAdapter.insert (EntityInsertAdapter.kt:59)
  at androidx.room.EntityUpsertAdapter.upsert (EntityUpsertAdapter.kt:75)
  at com.nextcloud.talk.data.database.dao.ConversationsDao_Impl.upsertConversations$lambda$1 (ConversationsDao_Impl.kt:354)
  at com.nextcloud.talk.data.database.dao.ConversationsDao_Impl.$r8$lambda$Iai0cI3gB6ZVPh_K7dOT6H7y3Nk (Unknown Source)
  at com.nextcloud.talk.data.database.dao.ConversationsDao_Impl$$ExternalSyntheticLambda1.invoke (D8$$SyntheticClass)
  at androidx.room.util.DBUtil__DBUtil_androidKt$performBlocking$1$invokeSuspend$$inlined$internalPerform$1$1.invokeSuspend (DBUtil.kt:61)
  at androidx.room.util.DBUtil__DBUtil_androidKt$performBlocking$1$invokeSuspend$$inlined$internalPerform$1$1.invoke (Unknown Source:8)
  at androidx.room.util.DBUtil__DBUtil_androidKt$performBlocking$1$invokeSuspend$$inlined$internalPerform$1$1.invoke (Unknown Source:4)
  at androidx.room.driver.SupportSQLitePooledConnection.transaction (SupportSQLiteConnectionPool.android.kt:83)
  at androidx.room.driver.SupportSQLitePooledConnection.withTransaction (SupportSQLiteConnectionPool.android.kt:66)
  at androidx.room.util.DBUtil__DBUtil_androidKt$performBlocking$1$invokeSuspend$$inlined$internalPerform$1.invokeSuspend (DBUtil.kt:59)
  at androidx.room.util.DBUtil__DBUtil_androidKt$performBlocking$1$invokeSuspend$$inlined$internalPerform$1.invoke (Unknown Source:8)
  at androidx.room.util.DBUtil__DBUtil_androidKt$performBlocking$1$invokeSuspend$$inlined$internalPerform$1.invoke (Unknown Source:4)
  at androidx.room.driver.SupportSQLiteConnectionPool.useConnection (SupportSQLiteConnectionPool.android.kt:42)
  at androidx.room.RoomConnectionManager.useConnection (RoomConnectionManager.android.kt:126)
  at androidx.room.RoomDatabase.useConnection$room_runtime_release (RoomDatabase.android.kt:593)
  at androidx.room.util.DBUtil__DBUtil_androidKt$performBlocking$1.invokeSuspend (DBUtil.android.kt:247)
  at androidx.room.util.DBUtil__DBUtil_androidKt$performBlocking$1.invoke (Unknown Source:8)
  at androidx.room.util.DBUtil__DBUtil_androidKt$performBlocking$1.invoke (Unknown Source:4)
  at androidx.room.coroutines.RunBlockingUninterruptible_androidKt$runBlockingUninterruptible$1$1.invokeSuspend (RunBlockingUninterruptible.android.kt:52)
  at androidx.room.coroutines.RunBlockingUninterruptible_androidKt$runBlockingUninterruptible$1$1.invoke (Unknown Source:8)
  at androidx.room.coroutines.RunBlockingUninterruptible_androidKt$runBlockingUninterruptible$1$1.invoke (Unknown Source:4)
  at kotlinx.coroutines.intrinsics.UndispatchedKt.startCoroutineUndispatched (Undispatched.kt:27)
  at kotlinx.coroutines.CoroutineStart.invoke (CoroutineStart.kt:90)
  at kotlinx.coroutines.AbstractCoroutine.start (AbstractCoroutine.kt:123)
  at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch (Builders.common.kt:52)
  at kotlinx.coroutines.BuildersKt.launch (Unknown Source:1)
  at androidx.room.coroutines.RunBlockingUninterruptible_androidKt$runBlockingUninterruptible$1.invokeSuspend (RunBlockingUninterruptible.android.kt:51)
  at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith (ContinuationImpl.kt:33)
  at kotlinx.coroutines.DispatchedTask.run (DispatchedTask.kt:104)
  at kotlinx.coroutines.EventLoopImplBase.processNextEvent (EventLoop.common.kt:277)
  at kotlinx.coroutines.BlockingCoroutine.joinBlocking (Builders.kt:95)
  at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking (Builders.kt:69)
  at kotlinx.coroutines.BuildersKt.runBlocking (Unknown Source:1)
  at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default (Builders.kt:48)
  at kotlinx.coroutines.BuildersKt.runBlocking$default (Unknown Source:1)
  at androidx.room.coroutines.RunBlockingUninterruptible_androidKt.runBlockingUninterruptible (RunBlockingUninterruptible.android.kt:45)
  at androidx.room.util.DBUtil__DBUtil_androidKt.performBlocking (DBUtil.android.kt:69)
  at androidx.room.util.DBUtil.performBlocking (Unknown Source:1)
  at com.nextcloud.talk.data.database.dao.ConversationsDao_Impl.upsertConversations (ConversationsDao_Impl.kt:353)
  at com.nextcloud.talk.conversationlist.data.network.OfflineFirstConversationsRepository$getRoom$1$1$onNext$1.invokeSuspend (OfflineFirstConversationsRepository.kt:101)
  at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith (ContinuationImpl.kt:33)
  at kotlinx.coroutines.DispatchedTask.run (DispatchedTask.kt:104)
  at kotlinx.coroutines.EventLoopImplBase.processNextEvent (EventLoop.common.kt:277)
  at kotlinx.coroutines.BlockingCoroutine.joinBlocking (Builders.kt:95)
  at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking (Builders.kt:69)
  at kotlinx.coroutines.BuildersKt.runBlocking (Unknown Source:1)
  at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default (Builders.kt:48)
  at kotlinx.coroutines.BuildersKt.runBlocking$default (Unknown Source:1)
  at com.nextcloud.talk.conversationlist.data.network.OfflineFirstConversationsRepository$getRoom$1$1.onNext (OfflineFirstConversationsRepository.kt:98)
  at com.nextcloud.talk.conversationlist.data.network.OfflineFirstConversationsRepository$getRoom$1$1.onNext (OfflineFirstConversationsRepository.kt:75)
  at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.drainNormal (ObservableObserveOn.java:201)
  at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.run (ObservableObserveOn.java:255)
  at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run (HandlerScheduler.java:124)

Start in OfflineFirstConversationsRepository.kt around lines 75, 98, and 101, then inspect the ConversationsDao upsert path shown in the stack trace. Reproduce the reported conversation update and determine why it reaches an UndeliverableException; done means the SQLite constraint failure is handled or prevented without the reported error.