diff --git a/src/Posting/QR.captcha.coffee b/src/Posting/QR.captcha.coffee
index f5f688e9e..a99fe7bb8 100644
--- a/src/Posting/QR.captcha.coffee
+++ b/src/Posting/QR.captcha.coffee
@@ -96,7 +96,7 @@ QR.captcha =
     $.rm @nodes.container if @nodes.container
     delete @nodes.container
 
-  sync: (captchas) ->
+  sync: (captchas=[]) ->
     @captchas = captchas
     @clear()
     @count()