Add missing player null check

PiperOrigin-RevId: 272654378

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerControlView.java

@@ -943,7 +943,7 @@ public class PlayerControlView extends FrameLayout {
     // Cancel any pending updates and schedule a new one if necessary.
     // Cancel any pending updates and schedule a new one if necessary.
     removeCallbacks(updateProgressAction);
     removeCallbacks(updateProgressAction);
     int playbackState = player == null ? Player.STATE_IDLE : player.getPlaybackState();
     int playbackState = player == null ? Player.STATE_IDLE : player.getPlaybackState();
-    if (player.isPlaying()) {
+    if (player != null && player.isPlaying()) {
       long mediaTimeDelayMs =
       long mediaTimeDelayMs =
           timeBar != null ? timeBar.getPreferredUpdateDelay() : MAX_UPDATE_INTERVAL_MS;
           timeBar != null ? timeBar.getPreferredUpdateDelay() : MAX_UPDATE_INTERVAL_MS;