Index: core/install.php
===================================================================
--- core/install.php	(revision 13806)
+++ core/install.php	(working copy)
@@ -1033,7 +1033,7 @@
 			return $sqls;
 		}
 
-		function RunUpgrade($module_name, $to_version, &$upgrade_data, &$start_from_query = 0)
+		function RunUpgrade($module_name, $to_version, &$upgrade_data, &$start_from_query)
 		{
 			$module_info = $upgrade_data[ strtolower($module_name) ];