Unreal Engine Crash

MachineId:E30515916A408B0AE4D1659CA61A70E1
    EpicAccountId:099d09c7b2bd4ffdb3696f00ab86ca36
    
     #0 at 0x7fffdea39dda *** Terminating app due to uncaught exception 'NSRangeException', reason: 'Cannot remove an observer <FAVPlayerDelegate 0x7fbf31a0e820> for the key path "status" from <AVPlayerItem 0x7fbf31c04ea0> because it is not registered as an observer.'
    
    __pthread_kill Address = 0x7fffdea39dda (filename not found) [in libsystem_kernel.dylib]
    abort Address = 0x7fffde99f420 (filename not found) [in libsystem_c.dylib]
    -[PLCrashReporter generateLiveReportWithThread:] Address = 0x10c7b9a5c (filename not found) [in UE4Editor-Core.dylib]
    Unknown() Address = 0x700017870240 (filename not found) [in ???]
    Unknown() Address = 0x7fffc9948d2a (filename not found) [in CoreFoundation]
    Unknown() Address = 0x7fffde02ef15 (filename not found) [in libobjc.A.dylib]
    std::__terminate(void (*)()) Address = 0x7fffdd520d69 (filename not found) [in libc++abi.dylib]
    __cxa_rethrow Address = 0x7fffdd5209f2 (filename not found) [in libc++abi.dylib]
    Unknown() Address = 0x7fffde02d16a (filename not found) [in libobjc.A.dylib]
    Unknown() Address = 0x7fffcb27681b (filename not found) [in Foundation]
    FAvfMediaPlayer::Close() Address = 0x1722aeb09 (filename not found) [in UE4Editor-AvfMedia.dylib]
    FMediaPlayerEditorModule::HandleEditorEndPIE(bool) Address = 0x1766a7d10 (filename not found) [in UE4Editor-MediaPlayerEditor.dylib]
    TBaseRawMethodDelegateInstance<false, FMediaPlayerEditorModule, void (bool)>::ExecuteIfSafe(bool) const Address = 0x1766a8aa6 (filename not found) [in UE4Editor-MediaPlayerEditor.dylib]
    TBaseMulticastDelegate<void, bool const>::Broadcast(bool) const Address = 0x114b9f90e (filename not found) [in UE4Editor-UnrealEd.dylib]
    UEditorEngine::EndPlayMap() Address = 0x114b9bd3b (filename not found) [in UE4Editor-UnrealEd.dylib]
    UEditorEngine::Tick(float, bool) Address = 0x1143d4d09 (filename not found) [in UE4Editor-UnrealEd.dylib]
    UUnrealEdEngine::Tick(float, bool) Address = 0x11500fe8c (filename not found) [in UE4Editor-UnrealEd.dylib]
    FEngineLoop::Tick() Address = 0x10c72ac79 (filename not found) [in UE4Editor]
    GuardedMain(wchar_t const*) Address = 0x10c731b72 (filename not found) [in UE4Editor]
    -[UE4AppDelegate runGameThread:] Address = 0x10c73f16c (filename not found) [in UE4Editor]
    -[FCocoaGameThread main] Address = 0x10c95e526 (filename not found) [in UE4Editor-Core.dylib]
    Unknown() Address = 0x7fffcb24e30d (filename not found) [in Foundation]
    _pthread_body Address = 0x7fffdeb22aab (filename not found) [in libsystem_pthread.dylib]
    _pthread_body Address = 0x7fffdeb229f7 (filename not found) [in libsystem_pthread.dylib]
    thread_start Address = 0x7fffdeb22221 (filename not found) [in libsystem_pthread.dylib]