Fix crach

app/src/leanback/java/com/fongmi/android/tv/ui/activity/DetailActivity.java

@@ -53,6 +53,7 @@ import com.fongmi.android.tv.utils.Prefers;
 import com.fongmi.android.tv.utils.ResUtil;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.ui.StyledPlayerView;
+import com.google.android.exoplayer2.util.Log;
 
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
@@ -266,7 +267,7 @@ public class DetailActivity extends BaseActivity implements CustomKeyDownVod.Lis
     }
 
     private void setFlagActivated(Vod.Flag item) {
-        if (item.isActivated()) return;
+        if (mFlagAdapter.size() == 0 || item.isActivated()) return;
         for (int i = 0; i < mFlagAdapter.size(); i++) ((Vod.Flag) mFlagAdapter.get(i)).setActivated(item);
         mBinding.flag.setSelectedPosition(mFlagAdapter.indexOf(item));
         mEpisodeAdapter.setItems(item.getEpisodes(), null);