Ticket #18455: 18455.patch

wp-includes/taxonomy.php

@@ -2803 +2803 @@
         // Touch every ancestor's lookup row for each post in each term
         foreach ( $term_ids as $term_id ) {
                 $child = $term_id;
-                while ( $parent = $terms_by_id[$child]->parent ) {
-                        if ( !empty($term_items[$term_id]) )
+                while ( !empty( $terms_by_id[$child] ) && $parent = $terms_by_id[$child]->parent ) {
+                        if ( !empty( $term_items[$term_id] ) )
                                 foreach ( $term_items[$term_id] as $item_id => $touches ) {
                                         $term_items[$parent][$item_id] = isset($term_items[$parent][$item_id]) ? ++$term_items[$parent][$item_id]: 1;
                                 }