From 679a2b0460a587b08cd4888c61d5cadeba87b9d1 Mon Sep 17 00:00:00 2001
From: Minku Lee <public@premi.st>
Date: Sun, 23 Aug 2020 19:06:16 +0900
Subject: [PATCH] Check window.external before checking
 msTrackingProtectionEnabled

---
 lib/web.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/web.js b/lib/web.js
index 3cf942ab..04e4466c 100644
--- a/lib/web.js
+++ b/lib/web.js
@@ -52,7 +52,7 @@ export const doNotTrack = () => {
     window.doNotTrack ||
     navigator.doNotTrack ||
     navigator.msDoNotTrack ||
-    'msTrackingProtectionEnabled' in window.external
+    (window.external && 'msTrackingProtectionEnabled' in window.external)
   ) {
     if (
       window.doNotTrack == '1' ||