From 69e7ab5a388560b2a1611dd5f40763222099fbc8 Mon Sep 17 00:00:00 2001
From: leibale eidelman <leibale1998@gmail.com>
Date: Mon, 30 Mar 2015 15:36:07 +0300
Subject: [PATCH] Update subscription.js

fix #466
---
 lib/pubsub/subscription.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/pubsub/subscription.js b/lib/pubsub/subscription.js
index 82a2babcd1f..9e2abb50430 100644
--- a/lib/pubsub/subscription.js
+++ b/lib/pubsub/subscription.js
@@ -263,7 +263,7 @@ Subscription.prototype.ack = function(ids, callback) {
     ackIds: ids
   };
   var path = this.name + ':acknowledge';
-  this.makeReq_('POST', path, null, body, callback);
+  this.makeReq_('POST', path, null, body, callback || util.noop);
 };
 
 /**