When fragment is detached from activity, getActivity() return null, so getActivity().getApplication() produce NPE. So we should check whether the fragment is attached to activity.

OsmAnd/src/net/osmand/plus/base/BaseOsmAndFragment.java

@@ -18,8 +18,11 @@ public class BaseOsmAndFragment extends Fragment {
 	private IconsCache iconsCache;
 
 	protected OsmandApplication getMyApplication() {
+		if (isAdded()) {
 			return (OsmandApplication) getActivity().getApplication();
 		}
+		return null;
+	}
 
 	protected OsmandActionBarActivity getMyActivity() {
 		return (OsmandActionBarActivity) getActivity();