diff --git a/setup/inc/class.setup.inc.php b/setup/inc/class.setup.inc.php
index 39194c3065..c8611f4f0c 100644
--- a/setup/inc/class.setup.inc.php
+++ b/setup/inc/class.setup.inc.php
@@ -20,6 +20,8 @@
 		var $db;
 		var $common;
 		var $accounts;
+		
+		function invalidate_session_cache() { }
 	}
 
 	class setup