Ticket #12949: menus_fatal_error_bug.diff

wp-admin/includes/nav-menu.php

@@ -247 +247 @@
         // @todo transient caching of these results with proper invalidation on updating of a tax of this type
         $terms = get_terms( $taxonomy['args']->name, $args );
 
-        if ( !$terms )
+        if ( !$terms || is_wp_error($terms) )
                 $error = '<li id="error">'. sprintf( __( 'No %s exists' ), $taxonomy['args']->label ) .'</li>';
 
         $term_names = '';