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I'm getting a crash,reported in crashlytics,and I have no idea how to reprouce the erro.In the crashed non-ui thread, a strange function is called, which is implemented by the cocos2d-x library(running in the ui thread).I have already looked up in the game logic code and can't find the call to the function:"btCollisionWorld::objectQuerySingleInternal".#12. Crashed: com.apple.root.default-qos0 Axxxx-mobile 0x103e500ed cocos2d::extension::ControlStepper::create(cocos2d::Sprite*, cocos2d::Sprite*) + 4391420141 1 libdispatch.dylib 0x1bbe6d7d4 _dispatch_client_callout + 162 libdispatch.dylib 0x1bbe11c7c _dispatch_queue_override_invoke + 6843 libdispatch.dylib 0x1bbe1e02c _dispatch_root_queue_drain + 3724 libdispatch.dylib 0x1bbe1e8d0 _dispatch_worker_thread2 + 1285 libsystem_pthread.dylib 0x1bc04d1b4 _pthread_wqthread + 4646 libsystem_pthread.dylib 0x1bc04fcd4 start_wqthread + 4