Ticket #18329: update_gallery_tab.diff

wp-admin/includes/media.php

@@ -40 +40 @@
                 return $tabs;
         }
 
+        if ( !isset($tabs['gallery']) ) {
+                return $tabs;
+        };
+
         $post_id = intval($_REQUEST['post_id']);
 
         if ( $post_id )