Index: branches/5.0.x/core/kernel/event_manager.php
===================================================================
diff -u -r12299 -r12368
--- branches/5.0.x/core/kernel/event_manager.php	(.../event_manager.php)	(revision 12299)
+++ branches/5.0.x/core/kernel/event_manager.php	(.../event_manager.php)	(revision 12368)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: event_manager.php 12299 2009-08-17 01:51:27Z dmitrya $
+* @version	$Id: event_manager.php 12368 2009-08-23 21:55:59Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -532,7 +532,7 @@
 
 
 			$this->Application->SetVar('m_opener', 's');
-			$this->Application->StoreVar(rtrim('opener_stack_'.$wid, '_'), serialize($opener_stack));
+			$this->Application->StoreVar(rtrim('opener_stack_'.$wid, '_'), serialize($opener_stack), !$opener_stack); // empty stack is optional
 		}
 
 		/**