From 09536e760bfad2ca0468ef3df956ff82efae9240 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Janosch=20M=C3=BCller?= <janosch.mueller@betterplace.org>
Date: Wed, 3 Jul 2019 11:55:19 +0200
Subject: [PATCH] Defensively verify that Symbol.for is available

closes #2007
---
 src/jsutils/nodejsCustomInspectSymbol.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/jsutils/nodejsCustomInspectSymbol.js b/src/jsutils/nodejsCustomInspectSymbol.js
index e98fece618..1b0aea72ca 100644
--- a/src/jsutils/nodejsCustomInspectSymbol.js
+++ b/src/jsutils/nodejsCustomInspectSymbol.js
@@ -1,7 +1,7 @@
 // @flow strict
 
 const nodejsCustomInspectSymbol =
-  typeof Symbol === 'function'
+  typeof Symbol === 'function' && typeof Symbol.for === 'function'
     ? Symbol.for('nodejs.util.inspect.custom')
     : undefined;