From eb7b2c459bc48af7ec23906e345215eaf2336723 Mon Sep 17 00:00:00 2001
From: Aaron Hamid <aaron.hamid@gmail.com>
Date: Tue, 24 Nov 2015 16:03:34 -0500
Subject: [PATCH] safely stringify PhantomJS undefined value

---
 lib/utils.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/utils.js b/lib/utils.js
index 298fdbc27e..f193a71ff1 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -598,7 +598,7 @@ exports.canonicalize = function(value, stack) {
       canonicalizedObj = value;
       break;
     default:
-      canonicalizedObj = value.toString();
+      canonicalizedObj = value + '';
   }
 
   return canonicalizedObj;