You will see the below error in the X-Cart log files.
QuoteAttempt to write data to a missing field of the table. Try to remove X-Cart cache to solve the problem.
Request URI:
As the message says, you will need to remove the X-Cart cache. Kindly browse the steps on clearing the X-Cart cache at https://www.milesweb.com/hosting-faqs/how-to-clear-x-cart-cache/ (https://www.milesweb.com/hosting-faqs/how-to-clear-x-cart-cache/)