Ticket #43025: 43025.diff

wp-includes/functions.php

@@ -3756 +3756 @@
  * @return array Array of found values.
  */
 function wp_list_filter( $list, $args = array(), $operator = 'AND' ) {
-        if ( ! is_array( $list ) ) {
+        if ( ! is_array( $list ) && ! is_a( $list, 'Traversable' ) ) {
                 return array();
         }