Check media and mediaItem for null as suggested by mfietz

core/src/main/java/de/danoeh/antennapod/core/service/playback/PlaybackService.java

@@ -405,9 +405,11 @@ public class PlaybackService extends MediaBrowserServiceCompat {
             Long feedId = Long.parseLong(parentId.split(":")[1]);
             List<FeedItem> feedItems = DBReader.getFeedItemList(DBReader.getFeed(feedId));
             for (FeedItem feedItem: feedItems) {
+                if(feedItem.getMedia() != null && feedItem.getMedia().getMediaItem() != null) {
                     mediaItems.add(feedItem.getMedia().getMediaItem());
                 }
             }
+        }
         result.sendResult(mediaItems);
     }