Pro site feature Pay to site Not working

After updating to the latest version of Pro site the "Pay to Site" feature is no longer working.

Sites which were previously expired are now being displayed live to the public.

Sites which PayPal has expired are now showing the following error:

"The example.com page isn’t working
example.com is currently unable to handle this request.
HTTP ERROR 500"

As a result of this error clients can't log back into their site to reactivate their PayPal subscription.

This needs to be fixed ASAP as I'm loosing revenue. This feature worked perfectly fine before now it does not.

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