1366 - Incorrect integer value: '' for column `shop_db3`.`whos_online`.`customer_id` at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', '32c37251dfbe6a87168674e1eae71016', '3.15.190.144', '1714118529', '1714118529', '/checkout_shipping.php?XTCsid=3cd37329143049d8f2fab7a46749bac8')

[XT SQL Error]