--- activitystream_feed.module	2010-05-06 10:35:58.000000000 -0700
+++ activitystream_feedNEW.module	2010-05-06 11:02:00.000000000 -0700
@@ -109,7 +109,7 @@ function activitystream_feed_activitystr
   return $form;  
 }
 
-function theme_activitystream_feed_icon($params) {
+function theme_activitystream_feed_icon($params = NULL) {
   $params = unserialize($params);
   // Return the favicon if we have it. Otherwise return a default feed icon.
   if ($params['favicon']) {