diff --git a/src/Posting/Captcha.t.coffee b/src/Posting/Captcha.t.coffee
index 954b23fd7..4485b58f1 100644
--- a/src/Posting/Captcha.t.coffee
+++ b/src/Posting/Captcha.t.coffee
@@ -48,7 +48,8 @@ Captcha.t =
     delete @nodes.container
 
   updateThread: ->
-    {boardID, threadID} = Captcha.t.currentThread
+    return unless @isEnabled
+    {boardID, threadID} = (Captcha.t.currentThread or {})
     newThread = Captcha.t.getThread()
     unless newThread.boardID is boardID and newThread.threadID is threadID
       Captcha.t.destroy()