kotlinx.coroutines.JobCancellationException: FlowSubscription was cancelled

I recently migrated a class that uses https://github.com/f2prateek/rx-preferences to now use FlowPreferences. In our app, when the user logs out, we clear all SharedPreferences. During the logout, the app is crashing with the following exception:

kotlinx.coroutines.JobCancellationException: FlowSubscription was cancelled; job=FlowSubscription{Cancelled}@bed4c69

There isn’t really any more details regarding the stack trace. I suspect I am running into https://github.com/Kotlin/kotlinx.coroutines/issues/974 which may make sense given FlowSharedPreferences.keyFlow is implemented as such:

  val keyFlow = callbackFlow {
    val listener = SharedPreferences.OnSharedPreferenceChangeListener { _, key -> offer(key) }
    sharedPreferences.registerOnSharedPreferenceChangeListener(listener)
    awaitClose { sharedPreferences.unregisterOnSharedPreferenceChangeListener(listener) }
  }

Something tells me that the offer(key) is being performed after the Channel has been closed.

[tfcporciuncula]

Now that the underlying coroutines issue is fixed, I’m reverting the fix we have for this in favor of the new trySend() method from 1.5.0. Everything should continue to work just fine, but I thought I’d mention this here just in case.

[tfcporciuncula]

Thanks for letting me know @mhernand40. I’ll keep this issue open since it might be relevant for other people using the library and will close it once there’s an actual fix in place.