iOS 13 crashes from UserNotifications

LibGdx app crashes on iOS 13 only, worked fine on iOS 12 and below. It is either cause of getPendingNotificationRequestsWithCompletionHandler:
or
removePendingNotificationRequestsWithIdentifiers: .

From the logs in firebase the app crashes when user speeds up the completion of a task and hence the notification has to be rescheduled by the new time.

Is there any change in iOS 13 that causes this crash?