Ticket #24020: 24020.patch

wp-admin/includes/upgrade.php

@@ -433 +433 @@
         foreach ($categories as $category) {
                 if ('' == $category->category_nicename) {
                         $newtitle = sanitize_title($category->cat_name);
-                        $wpdb>update( $wpdb->categories, array('category_nicename' => $newtitle), array('cat_ID' => $category->cat_ID) );
+                        $wpdb->update( $wpdb->categories, array('category_nicename' => $newtitle), array('cat_ID' => $category->cat_ID) );
                 }
         }