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@zanderso

I think this might trade the crash with potentially missing data...
The Firebase plugin should probably either disconnect listeners right before we set mNativeView to null, or otherwise queue the update...

Ideally plugins would have better connections to the lifecycle of the FlutterView and activity. But for now this will restore the behavior FlutterView used prior to the FlutterNativeView refactoring.

This specific issue is probably fixed after 619f452 since the BinaryMessenger handed to the plugin is the FlutterNativeView rather than the FlutterView. See: 619f452#diff-0fee8a5b0006794b358771128c92c9c8R96

However, adding these checks is probably harmless.