Index: trunk/admin/install/upgrade_errors.php
===================================================================
diff -u -r2536 -r2569
--- trunk/admin/install/upgrade_errors.php	(.../upgrade_errors.php)	(revision 2536)
+++ trunk/admin/install/upgrade_errors.php	(.../upgrade_errors.php)	(revision 2569)
@@ -21,6 +21,7 @@
     }
     $p = $path.$pathchar;
     /*Start looking for the root flag file */
+    if( !isset($pathtoroot) ) $pathtoroot = '';
     while(!strlen($pathtoroot) && strlen($p))
     {
       $sub = substr($p,strlen($pathchar)*-1);