From 6d2a942dd25e17790a165292376d480d99ab6c59 Mon Sep 17 00:00:00 2001
From: Wes Bos <wesbos@gmail.com>
Date: Mon, 13 Jun 2016 11:32:10 -0400
Subject: [PATCH] Check for document before checking for readyState

---
 inject.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/inject.js b/inject.js
index b6f2486..fe1ff99 100644
--- a/inject.js
+++ b/inject.js
@@ -122,7 +122,7 @@ chrome.extension.sendMessage({}, function(response) {
 
   function initializeWhenReady(document) {
     var readyStateCheckInterval = setInterval(function() {
-      if (document.readyState === 'complete') {
+      if (document && document.readyState === 'complete') {
         clearInterval(readyStateCheckInterval);
         initializeNow(document);
       }