Hello,

We recently upgraded to React Native 0.26.0 and since our production release have been seeing a large ramp up in the following crashes (This is from Bugsnag):

java.lang.AssertionError
        at com.facebook.infer.annotation.Assertions.assertNotNull(Assertions.java:21)
        at com.facebook.react.uimanager.events.EventDispatcher$DispatchEventsRunnable.run(EventDispatcher.java:305)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
        at android.os.Looper.loop(Looper.java:148)
        at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:187)
        at java.lang.Thread.run(Thread.java:818)

I dove in and saw that in EventDispatcher.java, mRCTEventEmitter is null and there’s nothing catching the exception. My urge is to check if it’s null and do something like this…

    if (mRCTEventEmitter == null) {
      mRCTEventEmitter = mReactContext.getJSModule(RCTEventEmitter.class);
    }

but that can’t be right - i don’t know why it’s null in the first place.

We’re not having these problems in iOS.

Thanks in advanced, and i hope i’ve provided enough info - please ask if i haven’t