Index: branches/5.0.x/core/kernel/session/session.php
===================================================================
diff -u -N -r12450 -r12592
--- branches/5.0.x/core/kernel/session/session.php	(.../session.php)	(revision 12450)
+++ branches/5.0.x/core/kernel/session/session.php	(.../session.php)	(revision 12592)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: session.php 12450 2009-09-05 13:39:05Z alex $
+* @version	$Id: session.php 12592 2009-09-22 21:00:10Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -142,9 +142,16 @@
 		$fields_hash = Array (
 			$this->IDField			=>	$session->SID,
 			$this->TimestampField	=>	$session->Expiration,
-			'BrowserSignature'		=>	$this->_getBrowserSignature(),
 		);
 
+		if (!defined('IS_INSTALL') || !IS_INSTALL) {
+			// this column was added only in 5.0.1 version,
+			// so accessing it while database is not upgraded
+			// will result in admin's inability to login inside
+			// installator
+			$fields_hash['BrowserSignature'] = $this->_getBrowserSignature();
+		}
+
 		// default values + additional values + values set during this script run
 		$additional_fields = array_merge($additional_fields, $this->DirectVars); // used 2 times later
 		$fields_hash = array_merge($fields_hash, $additional_fields);