Ticket #17670: 17670.4.diff

wp-includes/post.php

@@ -3164 +3164 @@
                 if ( $page->post_name == $revparts[0] ) {
                         $count = 0;
                         if ( $page->post_parent != 0 ) {
-                                if ( null === ( $parent_page = $pages[ $page->post_parent ] ) )
+                                $parent_page = ( isset( $pages[ $page->post_parent ] ) ) ? $pages[ $page->post_parent ] : null;
+                                if ( empty($parent_page) )
                                         continue;
 
-                                while ( $parent_page->ID != 0 ) {
+                                while ( !empty($parent_page) ) {
                                         $count++;
                                         if ( $parent_page->post_name != $revparts[ $count ] )
                                                 break;
-                                        $parent_page = $pages[ $parent_page->post_parent ];
+                                        $parent_page = ( isset( $pages[ $parent_page->post_parent ] ) ) ? $pages[ $parent_page->post_parent ] : null;
                                 }
 
-                                if ( $parent_page->ID == 0 && $count+1 == count($revparts) ) {
+                                if ( empty($parent_page) && $count+1 == count($revparts) ) {
                                         $foundid = $page->ID;
                                         break;
                                 }