An error occurs after closing PayPal's payment window during initializing.
Here is the screenshot:
http://pasteboard.co/7ENhaxhkY.jpg
So, just to be clear -- you're clicking the paypal button, but closing the window before it loads?
Exactly ;)
OK. This error was designed for iframe use-cases, in case the element is removed -- I'll probably disable this for the popup though, since it would need to be closed by the user.
Thanks for the catch.
Fixed and ready for deploy.
Pushed.