diff --git a/4chan_x.user.js b/4chan_x.user.js
index df472b741..42338d928 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -1900,6 +1900,9 @@
   updater = {
     init: function() {
       var checkbox, checked, dialog, html, input, name, title, _i, _len, _ref;
+      if (!$('form[name=post]')) {
+        return;
+      }
       if (conf['Scrolling']) {
         if (conf['Scroll BG']) {
           updater.focus = true;
diff --git a/script.coffee b/script.coffee
index 9c5908b79..c72112c0c 100644
--- a/script.coffee
+++ b/script.coffee
@@ -1433,6 +1433,8 @@ threadHiding =
 
 updater =
   init: ->
+    #thread closed
+    return unless $ 'form[name=post]'
     if conf['Scrolling']
       if conf['Scroll BG']
         updater.focus = true