diff -u b/core/modules/views_ui/views_ui.theme.inc b/core/modules/views_ui/views_ui.theme.inc
--- b/core/modules/views_ui/views_ui.theme.inc
+++ b/core/modules/views_ui/views_ui.theme.inc
@@ -57,9 +57,9 @@
     $variables['attributes']['title'][] = t('Overridden');
   }
 
+  $variables['name'] = isset($element['#name']) ? $element['#name'] : NULL;
+  $variables['overridden'] = isset($element['#overridden']) ? $element['#overridden'] : NULL;
   $variables['content'] = $element['#children'];
-  $variables['name'] = $element['#name'];
-  $variables['overridden'] = $element['#overridden'];
   $variables['title'] = $element['#title'];
   $variables['actions'] = !empty($element['#actions']) ? $element['#actions'] : array();
 }