From b9c1cc707625473fa32bb4076f6f154a01786661 Mon Sep 17 00:00:00 2001
From: Nathan Rajlich <nathan@tootallnate.net>
Date: Thu, 19 Feb 2015 17:57:44 -0800
Subject: [PATCH] Only copy ctx properties when `context` is defined

Fixes #12.
---
 index.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/index.js b/index.js
index 644efd1..ac03554 100644
--- a/index.js
+++ b/index.js
@@ -109,9 +109,11 @@ Script.prototype.runInNewContext = function (context) {
     var ctx = Script.createContext(context);
     var res = this.runInContext(ctx);
 
-    forEach(Object_keys(ctx), function (key) {
-        context[key] = ctx[key];
-    });
+    if (context) {
+        forEach(Object_keys(ctx), function (key) {
+            context[key] = ctx[key];
+        });
+    }
 
     return res;
 };