From 579b77806266069440e56532868dfb9482c2b880 Mon Sep 17 00:00:00 2001
From: kkapsner <github@mail.kkapsner.de>
Date: Wed, 29 May 2019 20:48:56 +0200
Subject: [PATCH] MutationObserver failed in some instances

Fixes #354
---
 lib/iframeProtection.js | 7 +++++--
 releaseNotes.txt        | 1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/iframeProtection.js b/lib/iframeProtection.js
index 996acea..ae90465 100644
--- a/lib/iframeProtection.js
+++ b/lib/iframeProtection.js
@@ -123,8 +123,11 @@
 			var observer = new MutationObserver(allCallback);
 			var observing = false;
 			function observe(){
-				if (!observing){
-					observer.observe(window.document.documentElement, {subtree: true, childList: true});
+				if (
+					!observing &&
+					window.document
+				){
+					observer.observe(window.document, {subtree: true, childList: true});
 					observing = true;
 				}
 			}
diff --git a/releaseNotes.txt b/releaseNotes.txt
index 7adb27f..5eaf255 100644
--- a/releaseNotes.txt
+++ b/releaseNotes.txt
@@ -12,6 +12,7 @@ Version 0.5.10:
 		- not connected iFrame threw error with persistent rng
 		- detection over document.write and document.writeln was possible
 		- google docs were broken in Waterfox
+		- MutationObserver failed in some instances
 	
 	known issues:
 		- if a data URL is blocked the page action button does not appear