From fe7904ae59a197868870bbea9b311ffa5d762494 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Renato=20B=C3=B6hler?= <renato.bohler@gmail.com>
Date: Wed, 8 Jan 2020 00:48:37 -0300
Subject: [PATCH] Fixes unchecked access to 'deploy' script on build

---
 packages/react-dev-utils/printHostingInstructions.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/react-dev-utils/printHostingInstructions.js b/packages/react-dev-utils/printHostingInstructions.js
index 9d40f66ac6a..625e9911150 100644
--- a/packages/react-dev-utils/printHostingInstructions.js
+++ b/packages/react-dev-utils/printHostingInstructions.js
@@ -22,7 +22,9 @@ function printHostingInstructions(
   if (publicUrl && publicUrl.includes('.github.io/')) {
     // "homepage": "http://user.github.io/project"
     const publicPathname = url.parse(publicPath).pathname;
-    const hasDeployScript = typeof appPackage.scripts.deploy !== 'undefined';
+    const hasDeployScript =
+      typeof appPackage.scripts !== 'undefined' &&
+      typeof appPackage.scripts.deploy !== 'undefined';
     printBaseMessage(buildFolder, publicPathname);
 
     printDeployInstructions(publicUrl, hasDeployScript, useYarn);