Thanks for raising this! I checked out that request ID, and it appears that the Recurring charge status for the Super Bar - Sticky Add To Cart app was updated to expired on that store on the 30th October.
It’s possible for the merchant to uninstall then reinstall the app in question, and accept the charges. The actual internal server error you had seen stemmed from a non nullable field being returned - the client side feedback could a little better handled in this scenario, definitely. I’ve raised that internally for the attention of our Billing team.
I hope that helps - if there’s any other queries please do let me know!