From 68fbfd5ce932e9e2a075eb8b9ccb11dbe91d67e8 Mon Sep 17 00:00:00 2001
From: DIYgod <diy.d.god@gmail.com>
Date: Thu, 17 May 2018 14:16:27 +0800
Subject: [PATCH] app: fix HEROKU_SLUG_COMMIT not exist

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

diff --git a/router.js b/router.js
index 55a62f6f49..228c82a5fe 100644
--- a/router.js
+++ b/router.js
@@ -9,7 +9,7 @@ let gitHash;
 try {
     gitHash = require('git-rev-sync').short();
 } catch (e) {
-    gitHash = process.env.HEROKU_SLUG_COMMIT.slice(0, 7) || 'unknown';
+    gitHash = (process.env.HEROKU_SLUG_COMMIT && process.env.HEROKU_SLUG_COMMIT.slice(0, 7)) || 'unknown';
 }
 const startTime = +new Date();
 router.get('/', async (ctx) => {