CameraUI -[CAMPriorityNotificationCenter _removeObserver:fromObserversByName:] i am seeing crashes on firebase and here is the stacktrace Fatal Exception: NSGenericException *** Collection <__NSArrayM: 0x28024a0a0> was mutated while being enumerated. keyboard_arrow_up 0 CoreFoundation __exceptionPreprocess 2 arrow_drop_down CoreFoundation -[__NSSingleObjectEnumerator initWithObject:collection:] arrow_right 3 CameraUI -[CAMPriorityNotificationCenter _removeObserver:fromObserversByName:] 4 CameraUI -[CAMPriorityNotificationCenter removeObserver:] 13 arrow_drop_down libsystem_pthread.dylib start_wqthread Crashed: com.google.firebase.crashlytics.ios.exception SIGABRT ABORT 0x00000001c1eb7334 keyboard_arrow_up 0 FirebaseCrashlytics FIRCLSProcess.c - Line 393 FIRCLSProcessRecordAllThreads + 393 1 FirebaseCrashlytics FIRCLSProcess.c - Line 424 FIRCLSProcessRecordAllThreads + 424 2 FirebaseCrashlytics FIRCLSHandler.m - Line 34 FIRCLSHandler + 34 3 FirebaseCrashlytics FIRCLSException.mm - Line 218 __FIRCLSExceptionRecord_block_invoke + 218 4 libdispatch.dylib _dispatch_client_callout + 20 5 arrow_drop_down libdispatch.dylib _dispatch_lane_barrier_sync_invoke_and_complete + 60 6 FirebaseCrashlytics FIRCLSException.mm - Line 225 FIRCLSExceptionRecord + 225 7 FirebaseCrashlytics FIRCLSException.mm - Line 111 FIRCLSExceptionRecordNSException + 111 8 FirebaseCrashlytics FIRCLSException.mm - Line 279 FIRCLSTerminateHandler() + 279 9 libc++abi.dylib std::__terminate(void (*)()) + 20 24 arrow_drop_down libsystem_pthread.dylib start_wqthread + 8 This started happening in 14.4 and above and was working fine in the previous version and am recently seeing an increase in the crash. Is it an OS or am i doing something wrong