Fix crash when favoriting Live TV program while loading additional channels in the guide

Author: nielsvanvelzen

app/src/main/java/org/jellyfin/androidtv/ui/livetv/LiveTvGuideFragment.java

@@ -235,7 +235,9 @@ private void load() {
 
     public void refreshFavorite(UUID channelId){
         for (int i = 0; i < mChannels.getChildCount(); i++) {
-            GuideChannelHeader gch = (GuideChannelHeader)mChannels.getChildAt(i);
+            View child = mChannels.getChildAt(i);
+            if (!(child instanceof GuideChannelHeader)) continue;
+            GuideChannelHeader gch = (GuideChannelHeader) child;
             if (gch.getChannel().getId().equals(channelId.toString()))
                 gch.refreshFavorite();
         }