if (player != null) {
  Log.d("ExoPlayerTunneling", String.format("isTunnelingEnabled=%b", player.isTunnelingEnabled()));
}

java.lang.NullPointerException: Attempt to read from field 'boolean com.google.android.exoplayer2.RendererConfiguration.tunneling' on a null object reference
    at com.google.android.exoplayer2.ExoPlayerImpl.isTunnelingEnabled(ExoPlayerImpl.java:1673)
    at com.google.android.exoplayer2.demo.PlayerActivity$PlayerEventListener.onTracksChanged(PlayerActivity.java:505)
    at com.google.android.exoplayer2.ExoPlayerImpl.lambda$updatePlaybackInfo$17(ExoPlayerImpl.java:1909)
    at com.google.android.exoplayer2.ExoPlayerImpl$$ExternalSyntheticLambda3.invoke(Unknown Source:4)
    at com.google.android.exoplayer2.util.ListenerSet$ListenerHolder.invoke(ListenerSet.java:282)
    at com.google.android.exoplayer2.util.ListenerSet.lambda$queueEvent$0(ListenerSet.java:190)
    at com.google.android.exoplayer2.util.ListenerSet$$ExternalSyntheticLambda1.run(Unknown Source:6)
    at com.google.android.exoplayer2.util.ListenerSet.flushEvents(ListenerSet.java:211)
    at com.google.android.exoplayer2.ExoPlayerImpl.updatePlaybackInfo(ExoPlayerImpl.java:1966)
    at com.google.android.exoplayer2.ExoPlayerImpl.handlePlaybackInfo(ExoPlayerImpl.java:1794)
    at com.google.android.exoplayer2.ExoPlayerImpl.lambda$new$1$com-google-android-exoplayer2-ExoPlayerImpl(ExoPlayerImpl.java:312)
    at com.google.android.exoplayer2.ExoPlayerImpl$$ExternalSyntheticLambda20.run(Unknown Source:4)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:223)
    at android.app.ActivityThread.main(ActivityThread.java:7668)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)