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', 'dubdovqkls3t5t1tifftrhr3t1', '18.97.14.84', '1749965491', '1749965491', '/product_info.php?info=p534_405724-Pfostentraeger-Dorn--zum-Aufschrauben--verstellbar--80x80.html')

[XT SQL Error]