Fix dead thread

app/src/main/java/org/libre/agosto/p2play/singletons/PlaybackSingleton.kt

@@ -16,16 +16,18 @@ object PlaybackSingleton {
     var video: VideoModel? = null
     private var withMediaSession = false
 
-    fun setData(mediaItem: MediaItem, video: VideoModel): ExoPlayer {
-        if (this.player!!.isPlaying) {
-            this.player!!.stop()
+    fun setData(mediaItem: MediaItem, video: VideoModel): ExoPlayer? {
+        player?.let {
+            if (it.isPlaying) {
+                it.stop()
+            }
+            it.setMediaItem(mediaItem)
+            // it.prepare()
+            this.video = video
+            return it
         }
-        this.player!!.setMediaItem(mediaItem)
-        this.player!!.prepare()
 
-        this.video = video
-
-        return this.player!!
+        return null
     }
 
     fun release() {