I have the SAME PROBLEM and they don't fix anything. No solutions from their support staff either.

This software is a mess and they don't even bother fixing an important issue!!!
What the hell Inuit?

How can I remove the current card and add another one for a customer?

How can I edit the card without that error?

I have been waiting for days and no response nor solution to the problem. 
This is important for my business!!!!