PHP / database error

An error has occurred. 0 Call to a member function get() on null

Believe that maybe the same issue as the below topic.

www.joomlapolis.com/forum/cb-paid-subscriptions-support/245176-changing-bank-details-or-payment-method?start=6

Check within _cbsubs_gateway_accounts database table and ensure you don't have any invalid rows. You might have a broken payment gateway entry. Will dig into this further if your payment gateways are fine and probably implement a fix in core CB for it as it's happening in the XML processing engine.

In the Joomla Admin Dashboard there is this message at the top:

That has already been fixed and is pending review. Once reviewed and merged all those implicit null deprecations will be fixed.

WOW, that was the solution!
www.joomlapolis.com/forum/cb-paid-subscriptions-support/245176-changing-bank-details-or-payment-method?start=6

Stripe was still in the database (I haven't used it for a long time). I deleted it, and the problem is solved. I can access the gateways; no more error messages.
Thank you, Krileon.

Ok, latest CB and CBSubs build releases solve all known PHP 8.4 deprecation warnings. So that should get rid of the implicit null spamming you were seeing.