Some null checks. Fixes https://github.com/austinhuang0131/barinsta/issues/274

app/src/main/java/awais/instagrabber/fragments/HashTagFragment.java

@@ -200,7 +200,7 @@ public class HashTagFragment extends Fragment implements SwipeRefreshLayout.OnRe
             Utils.openEmailAddress(getContext(), emailId);
         }
 
-        private void openPostDialog(final FeedModel feedModel,
+        private void openPostDialog(@NonNull final FeedModel feedModel,
                                     final View profilePicView,
                                     final View mainPostImage,
                                     final int position) {
@@ -209,6 +209,7 @@ public class HashTagFragment extends Fragment implements SwipeRefreshLayout.OnRe
                 opening = true;
                 new PostFetcher(feedModel.getShortCode(), newFeedModel -> {
                     opening = false;
+                    if (newFeedModel == null) return;
                     openPostDialog(newFeedModel, profilePicView, mainPostImage, position);
                 }).execute();
                 return;

app/src/main/java/awais/instagrabber/fragments/LocationFragment.java

@@ -198,7 +198,7 @@ public class LocationFragment extends Fragment implements SwipeRefreshLayout.OnR
             Utils.openEmailAddress(getContext(), emailId);
         }
 
-        private void openPostDialog(final FeedModel feedModel,
+        private void openPostDialog(@NonNull final FeedModel feedModel,
                                     final View profilePicView,
                                     final View mainPostImage,
                                     final int position) {
@@ -207,6 +207,7 @@ public class LocationFragment extends Fragment implements SwipeRefreshLayout.OnR
                 opening = true;
                 new PostFetcher(feedModel.getShortCode(), newFeedModel -> {
                     opening = false;
+                    if (newFeedModel == null) return;
                     openPostDialog(newFeedModel, profilePicView, mainPostImage, position);
                 }).execute();
                 return;

app/src/main/java/awais/instagrabber/fragments/main/DiscoverFragment.java

@@ -91,6 +91,7 @@ public class DiscoverFragment extends Fragment implements SwipeRefreshLayout.OnR
         discoverService.topicalExplore(new DiscoverService.TopicalExploreRequest(), new ServiceCallback<DiscoverService.TopicalExploreResponse>() {
             @Override
             public void onSuccess(final DiscoverService.TopicalExploreResponse result) {
+                if (result == null) return;
                 topicClusterViewModel.getList().postValue(result.getClusters());
                 binding.swipeRefreshLayout.setRefreshing(false);
             }