Index: branches/5.1.x/core/kernel/application.php
===================================================================
diff -u -r13635 -r13780
--- branches/5.1.x/core/kernel/application.php	(.../application.php)	(revision 13635)
+++ branches/5.1.x/core/kernel/application.php	(.../application.php)	(revision 13780)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: application.php 13635 2010-05-25 09:31:29Z alex $
+* @version	$Id: application.php 13780 2010-06-15 20:36:27Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -837,12 +837,14 @@
 				$this->setCache($serial_name, (int)$this->getCache($serial_name) + 1);
 			}
 
-			// delete cached mod-rewrite urls related to given prefix and id
-			$delete_clause = isset($id) ? $prefix . ':' . $id : $prefix;
+			if (!defined('IS_INSTALL') || !IS_INSTALL) {
+				// delete cached mod-rewrite urls related to given prefix and id
+				$delete_clause = isset($id) ? $prefix . ':' . $id : $prefix;
 
-			$sql = 'DELETE FROM ' . TABLE_PREFIX . 'CachedUrls
-					WHERE Prefixes LIKE ' . $this->Conn->qstr('%|' . $delete_clause . '|%');
-			$this->Conn->Query($sql);
+				$sql = 'DELETE FROM ' . TABLE_PREFIX . 'CachedUrls
+						WHERE Prefixes LIKE ' . $this->Conn->qstr('%|' . $delete_clause . '|%');
+				$this->Conn->Query($sql);
+			}
 		}
 
 		return $serial_name;