Ignore type error messages as headline messages.

src/utils.js

@@ -133,8 +133,10 @@
                 // type to "headline" when sending server messages. For now we
                 // check if an @ signal is included, and if not, we assume it's
                 // a headline message.
-                    (typeof from_jid !== 'undefined' && from_jid.indexOf('@') === -1)
-                ) {
+                (   $message.attr('type') !== 'error' &&
+                    typeof from_jid !== 'undefined' &&
+                    from_jid.indexOf('@') === -1
+                )) {
                 return true;
             }
             return false;