1366 - Incorrect integer value: '' for column `hbl_shop`.`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', '4avh7sjohle9f50mse9elt3o93', '18.216.171.199', '1747111691', '1747111691', '/product_info.php?info=p638_806347-Wachsbehaeltereinsatz-fuer-Bruehkessel-150-Liter.html')

[XT SQL Error]