Index: /var/www/mc/_community/trunk/html/sites/all/modules/contrib/messaging/messaging_notify/messaging_notify.module
===================================================================
--- messaging_notify.module	(revision 8515)
+++ messaging_notify.module	(working copy)
@@ -303,7 +303,7 @@
 
   // Now trigger notifications event
   $event = array(
-    'uid' => $node->sender,
+    'uid' => $message->sender,
     'oid' => $message->mqid,
     'type' => 'message',
     'action' => 'sent',