From 22acdb76f6a4b7f5640d90873094fca2b3911dfa Mon Sep 17 00:00:00 2001
From: Thomas Johansen <thomasjo@gmail.com>
Date: Thu, 31 Mar 2016 13:24:14 +0200
Subject: [PATCH] :bug: Fix potential null reference callback invokation

Fixes #11328
---
 script/utils/child-process-wrapper.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/script/utils/child-process-wrapper.js b/script/utils/child-process-wrapper.js
index 2afc57934..55e6733d1 100644
--- a/script/utils/child-process-wrapper.js
+++ b/script/utils/child-process-wrapper.js
@@ -17,7 +17,7 @@ exports.safeExec = function(command, options, callback) {
   var child = childProcess.exec(command, options, function(error, stdout, stderr) {
     if (error)
       process.exit(error.code || 1);
-    else
+    else if (callback)
       callback(null);
   });
   child.stderr.pipe(process.stderr);