Index: branches/5.2.x/core/kernel/application.php
===================================================================
diff -u -N -r15521 -r15532
--- branches/5.2.x/core/kernel/application.php	(.../application.php)	(revision 15521)
+++ branches/5.2.x/core/kernel/application.php	(.../application.php)	(revision 15532)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: application.php 15521 2012-08-20 13:58:49Z alex $
+* @version	$Id: application.php 15532 2012-09-10 18:01:43Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -1351,7 +1351,9 @@
 			return false;
 		}
 
-		return $this->ConfigValue('UseOutputCompression') && function_exists('gzencode') && strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip');
+		$accept_encoding = isset($_SERVER['HTTP_ACCEPT_ENCODING']) ? $_SERVER['HTTP_ACCEPT_ENCODING'] : '';
+
+		return $this->ConfigValue('UseOutputCompression') && function_exists('gzencode') && strstr($accept_encoding, 'gzip');
 	}
 
 	//	Facade