From 0d455a7af787176864612cde69a72f1a07cfc35a Mon Sep 17 00:00:00 2001
From: Andy Stewart <boss@airbladesoftware.com>
Date: Wed, 19 Oct 2016 14:17:03 +0100
Subject: [PATCH] Only restore shell if previously saved.

---
 autoload/gitgutter/utility.vim | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/autoload/gitgutter/utility.vim b/autoload/gitgutter/utility.vim
index 9e13a8b..77ad2dc 100644
--- a/autoload/gitgutter/utility.vim
+++ b/autoload/gitgutter/utility.vim
@@ -203,8 +203,10 @@ endfunction
 
 function! gitgutter#utility#restore_shell() abort
   if has('unix')
-    let &shell = s:shell
-    let &shellcmdflag = s:shellcmdflag
-    let &shellredir = s:shellredir
+    if exists('s:shell')
+      let &shell = s:shell
+      let &shellcmdflag = s:shellcmdflag
+      let &shellredir = s:shellredir
+    endif
   endif
 endfunction