Fatal error with Prosites and Stripe

I was testing my prosite setup with stripe and seem to have broken my prosites setup and now unable to fix it. This is what I did:

1. Previously I had a 3 month prosite (test mode) subscription with stripe for a subsite.
2. On stripe I permanently deleted that customer
3. Since that point I am unable to login to my subsite and get the following fatal error
Fatal error: Call to a member function retrieve() on null in ......../wp-content/plugins/pro-sites/pro-sites-files/gateways/gateway-stripe.php on line 3303

I have tried to change the gateway from stripe to manual, but still cannot login to the subsite. I can log fine as the network admin, but cant log as the subsite admin.

Is there a way I (as network admin) can clear all customer details for the prosite and get a new customer id for it from stripe.

Attached screenshot shows what my ProSites Management screen looks like.

Really appreciate your help.