Index: branches/5.2.x/core/kernel/session/session.php
===================================================================
diff -u -N -r13840 -r14092
--- branches/5.2.x/core/kernel/session/session.php	(.../session.php)	(revision 13840)
+++ branches/5.2.x/core/kernel/session/session.php	(.../session.php)	(revision 14092)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: session.php 13782 2010-06-15 20:41:16Z alex $
+* @version	$Id: session.php 14092 2010-11-26 22:43:15Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -451,7 +451,11 @@
 
 		$user_id = $session->RecallVar('user_id');
 
-		if ($user_id != USER_GUEST) {
+		if ($user_id == USER_GUEST || $user_id === false) {
+			// -2 (when not logged in), false (when after u:OnLogout event)
+			$session->RemoveVar($var_name);
+		}
+		else {
 			$sql = 'DELETE FROM '.TABLE_PREFIX.'PersistantSessionData
 					WHERE PortalUserId = '.$user_id.' AND VariableName = '.$this->Conn->qstr($var_name);
 			$this->Conn->Query($sql);