diff --git includes/admin.inc includes/admin.inc
index b020a5d..74a6f15 100644
--- includes/admin.inc
+++ includes/admin.inc
@@ -1293,8 +1293,11 @@ function template_preprocess_views_ui_edit_item(&$vars) {
     // Get relationship labels
     $relationships = array();
     // @todo: get_handlers()
-    foreach ($display->handler->get_handlers('relationship') as $id => $handler) {
-      $relationships[$id] = $handler->label();
+    $handlers = $display->handler->get_handlers('relationship');
+    if ($handlers) {
+      foreach ($handlers as $id => $handler) {
+        $relationships[$id] = $handler->label();
+      }
     }
   }