--- comment_notify.install	2009-05-19 18:40:25.000000000 +1200
+++ comment_notify.install_new	2009-05-19 18:39:47.000000000 +1200
@@ -28,7 +28,7 @@ function comment_notify_install() {
         PRIMARY KEY (cid)
       )");
       $status[] = db_query("CREATE INDEX {comment_notify}_notify_hash_idx ON {comment_notify} (notify_hash)");
-      $status[] = db_query("INSERT INTO {comment_notify} (cid, notify, notify_hash) SELECT c.cid, 0, md5(concat(c.mail, ifnull(u.mail, u.init), c.uid, c.name, c.nid)) FROM {comments} c LEFT OUTER JOIN {users} u on c.uid = u.uid");
+      $status[] = db_query("INSERT INTO {comment_notify} (cid, notify, notify_hash) SELECT c.cid, 0, md5(c.mail || COALESCE(u.mail, u.init) || c.uid || c.name || c.nid) FROM {comments} c LEFT OUTER JOIN {users} u on c.uid = u.uid");
       break;
   }