From 50d73e3709d9d46985bc3e0e52ebdadcc2e0d95c Mon Sep 17 00:00:00 2001
From: Jonathan Ong <jonathanrichardong@gmail.com>
Date: Tue, 8 Oct 2013 23:23:14 -0700
Subject: [PATCH] onerror: check existence of error

---
 lib/context.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/context.js b/lib/context.js
index 12762e3..1eba80d 100644
--- a/lib/context.js
+++ b/lib/context.js
@@ -644,6 +644,11 @@ module.exports = {
    */
 
   onerror: function(err){
+    // don't do anything if there is no error.
+    // this allows you to pass `this.onerror`
+    // to node-style callbacks.
+    if (!err) return;
+
     // nothing we can do here other
     // than delegate to the app-level
     // handler and log.