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Attempt to invoke interface method 'int java.util.List.size()' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference	at dji.sdk.FlightController.DJIIntelligentFlightAssistant$InnerEventBus.onEventBackgroundThread(Unknown Source)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at dji.thirdparty.eventbus.EventBus.invokeSubscriber(EventBus.java:569)	at dji.thirdparty.eventbus.EventBus.postToSubscription(EventBus.java:513)	at dji.thirdparty.eventbus.EventBus.postSingleEvent(EventBus.java:475)	at dji.thirdparty.eventbus.EventBus.post(EventBus.java:365)	at dji.midware.data.manager.P3.t.post(Unknown Source)	at dji.midware.data.manager.P3.t.setPushRecData(Unknown Source)	at dji.midware.data.manager.P3.t.setPushRecPack(Unknown Source)	at dji.midware.data.manager.P3.l.b(Unknown Source)	at dji.midware.data.manager.P3.l.a(Unknown Source)	at dji.midware.data.manager.P3.l.a(Unknown Source)	at dji.midware.usb.P3.UsbAccessoryService$1.onGetBody(Unknown Source)	at dji.midware.f.a.f.b(Unknown Source)	at dji.midware.f.a.f.a(Unknown Source)	at dji.midware.usb.P3.UsbAccessoryService$RecvBufferRunnable.run(Unknown Source)	at java.lang.Thread.run(Thread.java:818)