Hi, I am facing a strange issue in my app there is an intermittent crash, I am using AVSpeechSynthesizer for speech discovery not sure if that is causing the problem crash log has below information: Firebase Crash log Crashed: AXSpeech 0 CoreFoundation 0x197325d00 _CFAssertMismatchedTypeID + 112 1 CoreFoundation 0x197229188 CFRunLoopSourceIsSignalled + 314 2 Foundation 0x198686ca0 performQueueDequeue + 440 3 Foundation 0x19868641c __NSThreadPerformPerform + 112 4 CoreFoundation 0x19722c990 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 5 CoreFoundation 0x19722c88c __CFRunLoopDoSource0 + 208 6 CoreFoundation 0x19722bbfc __CFRunLoopDoSources0 + 376 7 CoreFoundation 0x197225b70 __CFRunLoopRun + 820 8 CoreFoundation 0x197225308 CFRunLoopRunSpecific + 600 9 Foundation 0x198514d8c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 232 10 libAXSpeechManager.dylib 0x1c3ad0bbc -[AXSpeechThread main] 11 Foundation 0x19868630c __NSThread__start__ + 864 12 libsystem_pthread.dylib 0x1e2f20bfc _pthread_start + 320 13 libsystem_pthread.dylib 0x1e2f29758 thread_start + 8 Apple Crash log Crash log