Odoo Enterprise v16

I'm having an issue with eCommerce. Customers can select items, process their cart, and pay successfully, but immediately after the Stripe transaction, when the confirmation page should be generated, this error message appears:

Internal server error

new row for relation "account_move_line" violates check constraint "account_move_line_check_accountable_required_fields"

DETAIL:  Failing row contains (4835, 3760, 12, 2, 2, 100, null, 2, 27, null, null, null, null, null, null, null, null, null, null, null, null, 6, 6, null, null, null, Customer Payment $ 20.00 - Aetus Art - 11/29/2024, null, null, product, null, 2024-11-29, null, null, 0.00, 20.00, -20.00, -20.00, null, null, null, 1.00, 0.00, null, null, 0.00, null, null, null, null, f, 2024-11-29 22:55:41.594826, 2024-11-29 22:55:41.594826, null, null, null, null, null, null, null).

I can't attach screen cap to this post unfortunately, but I've identified from logs that the account_id is present for Outstanding Receipts but not for whatever other half of the journal entry it's trying to make. What should that account be (e.g., type) and where do I set it? I have all the fields in Settings/Accounting/Default Accounts set and they seem valid.

I'm getting the money from the purchases but the customers keep thinking nothing happened and so they redo their transactions and I'm forced to do refunds. Until I get this fixed, my web store is disabled from taking payments. Please help, and thank you!