[Fixed] Can't upgrade to plus

Good morning
Tried 3 times to upgrade to plus. Once put payment details and press enter, a green tick comes up then hangs on a blank page with this address

if I put cursor in the address bar and hit enter I get

Error: 400

Must POST stripeToken and productId variables.

Tried on firefox and chrome browsers.



@michaelwho, this has been fixed. Sorry about the bug.