From 6e41309ede2afc1e6de5776670da731aa36cefd8 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Sat, 1 Nov 2014 19:28:35 +1100
Subject: [PATCH] add err.stack test to code frame error capture

---
 lib/6to5/util.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/6to5/util.js b/lib/6to5/util.js
index 23a239d5c6..a1c97c3686 100644
--- a/lib/6to5/util.js
+++ b/lib/6to5/util.js
@@ -245,7 +245,7 @@ exports.parse = function (opts, code, callback) {
         message += frame;
       }
 
-      err.stack   = err.stack.replace(err.message, message);
+      if (err.stack) err.stack = err.stack.replace(err.message, message);
       err.message = message;
     }