NullPointerException in EventLogger.printMetadata

[stari4ek]

I'm seeing rare NullPointerException inside metadata analytics processing:

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'int com.google.android.exoplayer2.c.a.a()' on a null object reference
       at com.google.android.exoplayer2.util.EventLogger.printMetadata(EventLogger.java:469)
       at com.google.android.exoplayer2.util.EventLogger.onMetadata(EventLogger.java:266)
       at com.google.android.exoplayer2.analytics.AnalyticsCollector.onMetadata(AnalyticsCollector.java:176)
       at com.google.android.exoplayer2.SimpleExoPlayer$ComponentListener.onMetadata(SimpleExoPlayer.java:1364)
       at com.google.android.exoplayer2.metadata.MetadataRenderer.invokeRendererInternal(MetadataRenderer.java:191)
       at com.google.android.exoplayer2.metadata.MetadataRenderer.handleMessage(MetadataRenderer.java:182)
       at android.os.Handler.dispatchMessage(Handler.java:101)
       at android.os.Looper.loop(Looper.java:164)
       at android.app.ActivityThread.main(ActivityThread.java:6541)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

From mapping:

com.google.android.exoplayer2.metadata.Metadata -> com.google.android.exoplayer2.c.a:
 ...
    66:66:int length() -> a

So it crashes in one branch of callback propagation which does not have null-check guard

• using b771091
• no stream sample. I'm seeing it in crash reporting system