From 0bf4af1175c0c559204c49dd0bdbc735926e7a12 Mon Sep 17 00:00:00 2001
From: Dhilan007 <wenhai.lin@chukong-inc.com>
Date: Wed, 16 Jul 2014 15:36:50 +0800
Subject: [PATCH] fixed crash in setup.py script.

---
 setup.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/setup.py b/setup.py
index 49f67ba7ff..08ca197bdb 100755
--- a/setup.py
+++ b/setup.py
@@ -98,7 +98,11 @@ class SetEnvVar(object):
         return sys.platform == 'darwin'
 
     def _is_zsh(self):
-        return os.environ.get('SHELL')[-3:] == "zsh"
+        shellItem = os.environ.get('SHELL')
+        if shellItem is not None:
+            if len(shellItem) >= 3:
+                return shellItem[-3:] == "zsh"
+        return False
 
     def _get_unix_file_list(self):
         file_list = None