ExoPlayer ConcatenatingMediaSource ArrayIndexOutOfBoundsException

Question

清理播放列表并添加新曲目后，如果尝试播放最后一个曲目，则会出现以下错误：

E/ExoPlayerImplInternal: Internal runtime error.
    java.lang.ArrayIndexOutOfBoundsException: length=50; index=50
        at com.google.android.exoplayer2.source.ConcatenatingMediaSource$ConcatenatedTimeline.getTimelineByChildIndex(ConcatenatingMediaSource.java:777)
        at com.google.android.exoplayer2.source.AbstractConcatenatedTimeline.getNextWindowIndex(AbstractConcatenatedTimeline.java:66)
        at com.google.android.exoplayer2.Timeline.getNextPeriodIndex(Timeline.java:670)
        at com.google.android.exoplayer2.Timeline.isLastPeriod(Timeline.java:692)
        at com.google.android.exoplayer2.MediaPeriodQueue.isLastInTimeline(MediaPeriodQueue.java:747)
        at com.google.android.exoplayer2.MediaPeriodQueue.getMediaPeriodInfoForContent(MediaPeriodQueue.java:714)
        at com.google.android.exoplayer2.MediaPeriodQueue.getMediaPeriodInfo(MediaPeriodQueue.java:672)
        at com.google.android.exoplayer2.MediaPeriodQueue.getFirstMediaPeriodInfo(MediaPeriodQueue.java:500)
        at com.google.android.exoplayer2.MediaPeriodQueue.getNextMediaPeriodInfo(MediaPeriodQueue.java:125)
        at com.google.android.exoplayer2.ExoPlayerImplInternal.maybeUpdateLoadingPeriod(ExoPlayerImplInternal.java:1482)
        at com.google.android.exoplayer2.ExoPlayerImplInternal.updatePeriods(ExoPlayerImplInternal.java:1367)
        at com.google.android.exoplayer2.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:495)
        at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:301)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:135)
        at android.os.HandlerThread.run(HandlerThread.java:61)

索引我的最后一个曲目是49，我调用函数seekTo(49, 0)，但是如果我不清除播放列表并且不添加新曲目就可以了。 编写一些功能的代码：

 override fun addMusicInPlaylist(listSong: List<Song>, removeOld: Boolean) {
        val dataSource = DefaultHttpDataSourceFactory(Util.getUserAgent(this, getString(R.string.app_name))).createDataSource()
        dataSource.setRequestProperty("Referer", "http://example.com/")
        val factory = DataSource.Factory { dataSource }
        val listMediaSources = ArrayList<MediaSource>()
        listSong.forEachWithIndex { i, it->
            listMediaSources.add(SongMediaSource(ExtractorMediaSource.Factory(factory).createMediaSource(Uri.parse(it.url)),it))
        }
        if (removeOld) {
            exoPlayer.playWhenReady = false
            mediaSources.clear {
                mediaSources.addMediaSources(listMediaSources)
            }
        } else
            mediaSources.addMediaSources(listMediaSources)

    }

override fun changeSong(song: Song, position: Int) {
        if (songId == song.songId)
            exoPlayer.playWhenReady = !exoPlayer.playWhenReady
        else {
            songId = song.songId
            exoPlayer.seekTo(position, C.TIME_UNSET)
            exoPlayer.playWhenReady = true
        }
    }