Ticket #28214: Ticket #28214.patch

query.php

@@ -2622 +2622 @@
                         $orderby = "FIELD( {$wpdb->posts}.post_parent, $post_parent__in )";
                 } else {
                         // Used to filter values
-                        $allowed_keys = array('name', 'author', 'date', 'title', 'modified', 'menu_order', 'parent', 'ID', 'rand', 'comment_count');
+                        $allowed_keys = array('name', 'author', 'date', 'title', 'modified', 'menu_order', 'parent', 'ID', 'rand', 'comment_count', 'type');
                         if ( !empty($q['meta_key']) ) {
                                 $allowed_keys[] = $q['meta_key'];
                                 $allowed_keys[] = 'meta_value';