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my app crashed on iOS 12 only. this is the message, anyone help me , thanks.Crashed: com.apple.coremedia.player.async.0x2856cf1800 QuartzCore 0x1beb61578 X::Ref<CA::Shape>::operator=(CA::Shape*) + 201 QuartzCore 0x1beb61434 CABackingStoreGetFrontTexture(CABackingStore*, CGColorSpace*) + 3482 QuartzCore 0x1beb612a8 CABackingStoreRetainFrontTexture + 483 QuartzCore 0x1bec88e54 -[CALayer(CALayerPrivate) _copyRenderLayer:layerFlags:commitFlags:] + 6764 QuartzCore 0x1bec8e9e4 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 4485 QuartzCore 0x1bec8e928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 2606 QuartzCore 0x1bec8e928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 2607 QuartzCore 0x1bec8e928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 2608 QuartzCore 0x1bec8e928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 2609 QuartzCore 0x1bec8e928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 26010 QuartzCore 0x1bec8e928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 26011 QuartzCore 0x1bec8e928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 26012 QuartzCore 0x1bec8e928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 26013 QuartzCore 0x1bebe2528 CA::Context::commit_transaction(CA::Transaction*) + 324014 QuartzCore 0x1bec102f4 CA::Transaction::commit() + 60815 MediaToolbox 0x1bf1012b0 remoteXPCPlayer_setClientVideoLayerArray + 128416 MediaToolbox 0x1bf100548 remoteXPCPlayer_SetProperty + 34017 MediaToolbox 0x1bf0675dc playerasync_runOneCommand + 187618 MediaToolbox 0x1bf06a380 playerasync_runAsynchronousCommandOnQueue + 17219 libdispatch.dylib 0x1ba0d4484 _dispatch_client_callout + 1620 libdispatch.dylib 0x1ba0aefb0 _dispatch_lane_serial_drain$VARIANT$armv81 + 54821 libdispatch.dylib 0x1ba0afb2c _dispatch_lane_invoke$VARIANT$armv81 + 46822 libdispatch.dylib 0x1ba0b6afc _dispatch_root_queue_drain + 34423 libdispatch.dylib 0x1ba0b68a8 _dispatch_worker_thread + 27624 libsystem_pthread.dylib 0x1ba2b52fc _pthread_body + 12825 libsystem_pthread.dylib 0x1ba2b525c _pthread_start + 4826 libsystem_pthread.dylib 0x1ba2b8d08 thread_start + 4the detail message here: http://crashes.to/s/5390fe23bcc