Ticket #26103: 26103.diff

src/wp-admin/includes/upgrade.php

@@ -2007 +2007 @@
  * @since 2.9.0
  */
 function pre_schema_upgrade() {
-        global $wp_current_db_version, $wp_db_version, $wpdb;
+        global $wp_current_db_version, $wpdb;
 
         // Upgrade versions prior to 2.9
         if ( $wp_current_db_version < 11557 ) {