Magento 2: Error on checkout “Logged in customer Checkout getting No such entity with orderId =” for logged in customer

Question

I'm using a Magento 2.3.2 in our production site.

But I don't know why when I try to place an order with an existing user, I am getting No such entity with orderId=. When I buy something as a guest, there isn't any problem.

How can I fix it?

When I check the error in Chrome console, I get the following:

POST http://XXXX/rest/en/V1/carts/mine/payment-information 400 (Bad Request)

Answer 1

For the people who also get this problem, the problem was solved months ago by an external debugger / Magento specialist. The problem was Mageplaza_SameOrderNumber extension. When disabled the order gets successfully created.