Ticket #21534: 21534.2.diff

src/wp-includes/nav-menu-template.php

@@ -317 +317 @@
          */
         $sorted_menu_items = apply_filters( 'wp_nav_menu_objects', $sorted_menu_items, $args );
 
-        $items .= walk_nav_menu_tree( $sorted_menu_items, $args->depth, $args );
+        $items .= walk_nav_menu_tree( $sorted_menu_items, $args->depth, (array) $args );
         unset($sorted_menu_items);
 
         // Attributes