From f9f2c53b1301ecb667aab8626d60eaa44313e6e3 Mon Sep 17 00:00:00 2001
From: Nick Olinger <olingern@gmail.com>
Date: Tue, 28 Jan 2020 03:00:10 +0900
Subject: [PATCH] handle instances where caseless is not defined on response

---
 src/util/request-manager.js | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/util/request-manager.js b/src/util/request-manager.js
index 8b2226ae6a..eda4b5969a 100644
--- a/src/util/request-manager.js
+++ b/src/util/request-manager.js
@@ -433,9 +433,7 @@ export default class RequestManager {
           }
         }
 
-        const server = res.caseless.get('server');
-
-        if (res.statusCode === 401 && server === 'GitHub.com') {
+        if (res.statusCode === 401 && res.caseless && res.caseless.get('server') === 'GitHub.com') {
           const message = `${res.body.message}. If using GITHUB_TOKEN in your env, check that it is valid.`;
           rejectWithoutUrl(new Error(this.reporter.lang('unauthorizedResponse', server, message)));
         }