Bug 1230087 - Null-check content in updateReaderButton. r=gijs
authorJared Wein <jwein@mozilla.com>
Mon, 14 Dec 2015 10:21:00 +0100
changeset 276731 5ce3cd50888850c0cd599fe0c818ee39a1290da8
parent 276730 01cff68d5e39022df92399bd8eb00b7165027e17
child 276732 22aa3e580b1d2ba89cca4bd4ef32de2378ec978a
push id69273
push usercbook@mozilla.com
push dateThu, 17 Dec 2015 11:03:52 +0000
treeherdermozilla-inbound@565d7ae436ba [default view] [failures only]
perfherder[talos] [build metrics] [platform microbench] (compared to previous push)
reviewersgijs
bugs1230087
milestone46.0a1
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Bug 1230087 - Null-check content in updateReaderButton. r=gijs
browser/base/content/tab-content.js
--- a/browser/base/content/tab-content.js
+++ b/browser/base/content/tab-content.js
@@ -329,17 +329,17 @@ var AboutReaderListener = {
   /**
    * NB: this function will update the state of the reader button asynchronously
    * after the next mozAfterPaint call (assuming reader mode is enabled and
    * this is a suitable document). Calling it on things which won't be
    * painted is not going to work.
    */
   updateReaderButton: function(forceNonArticle) {
     if (!ReaderMode.isEnabledForParseOnLoad || this.isAboutReader ||
-        !(content.document instanceof content.HTMLDocument) ||
+        !content || !(content.document instanceof content.HTMLDocument) ||
         content.document.mozSyntheticDocument) {
       return;
     }
 
     this.scheduleReadabilityCheckPostPaint(forceNonArticle);
   },
 
   cancelPotentialPendingReadabilityCheck: function() {