Ticket #37575: 37575.patch

wp-admin/js/customize-nav-menus.js

@@ -1320 +1320 @@
                         containerClasses = [
                                 'menu-item',
                                 'menu-item-depth-' + String( control.params.depth ),
-                                'menu-item-' + settingValue.object,
+                                'menu-item-' + settingValue.type,
                                 'menu-item-edit-inactive'
                         ];