线上偶发报错：NullPointerException

[jarvan11]

java.lang.NullPointerException: Attempt to read from field 'java.lang.String android.content.pm.PackageInfo.versionName' on a null object reference
at com.google.android.exoplayer2.util.Util.getUserAgent(Util.java:1485)
at com.lzx.starrysky.playback.ExoPlayback.buildDataSourceFactory(ExoPlayback.kt:282)
at com.lzx.starrysky.playback.ExoPlayback.createMediaSource(ExoPlayback.kt:207)
at com.lzx.starrysky.playback.ExoPlayback.play(ExoPlayback.kt:149)
at com.lzx.starrysky.manager.PlaybackManager.onRestoreMusic(PlaybackManager.kt:253)
at com.lzx.starrysky.manager.MediaSessionManager$MediaSessionCallback.onPlay(MediaSessionManager.kt:98)
at android.support.v4.media.session.MediaSessionCompat$Callback$MediaSessionCallbackApi21.onPlay(MediaSessionCompat.java:1621)
at android.media.session.MediaSession$Callback.onMediaButtonEvent(MediaSession.java:931)
at android.support.v4.media.session.MediaSessionCompat$Callback$MediaSessionCallbackApi21.onMediaButtonEvent(MediaSessionCompat.java:1611)
at android.media.session.MediaSession$CallbackMessageHandler.handleMessage(MediaSession.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:219)
at android.app.ActivityThread.main(ActivityThread.java:8679)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1109)