From 50e0c4f4d0619335e30e11ca2345dfdb3f73ede1 Mon Sep 17 00:00:00 2001
From: Mathias Buus <mathiasbuus@gmail.com>
Date: Tue, 19 May 2015 20:24:47 +0200
Subject: [PATCH] code can be undefined

---
 index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.js b/index.js
index d9127db..0bc3ea0 100644
--- a/index.js
+++ b/index.js
@@ -96,7 +96,7 @@ exports.unmount = function (mnt, cb) {
 }
 
 exports.errno = function (code) {
-  return exports[code.toUpperCase()] || -1
+  return (code && exports[code.toUpperCase()]) || -1
 }
 
 exports.EPERM = -1