diff --git a/infolog/inc/class.uiinfolog.inc.php b/infolog/inc/class.uiinfolog.inc.php
index 8b4d02cb56..5f6b944ecf 100644
--- a/infolog/inc/class.uiinfolog.inc.php
+++ b/infolog/inc/class.uiinfolog.inc.php
@@ -248,7 +248,7 @@
 			return $headers;
 		}
 
-		function get_referer($vars)
+		function get_referer($vars='')
 		{
 			if(!$vars)
 			{