diff --git a/phpgwapi/inc/common_functions.inc.php b/phpgwapi/inc/common_functions.inc.php
index a1495d82af..db4763644f 100755
--- a/phpgwapi/inc/common_functions.inc.php
+++ b/phpgwapi/inc/common_functions.inc.php
@@ -1241,7 +1241,7 @@ foreach(array('_GET','_POST','_REQUEST','HTTP_GET_VARS','HTTP_POST_VARS') as $n
 	}
 	// do the check for script-tags only for _GET and _POST or if we found something in _GET and _POST
 	// speeds up the execusion a bit
-	if (isset($GLOBALS[$where]) && is_array($GLOBALS[$where]) && ($n < 2 || is_array($GLOBALS['egw_unset_vars'])))
+	if (isset($GLOBALS[$where]) && is_array($GLOBALS[$where]) && ($n < 2 || isset($GLOBALS['egw_unset_vars'])))
 	{
 		_check_script_tag($GLOBALS[$where],$where);
 	}