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', 's479jrm9d9j0s4b1o9jngpr6c1', '3.139.237.218', '1747122316', '1747122316', '/product_info.php?info=p26_800239-Ueberhitzungsschutzschalter-fuer-E-Futterdaempfer.html')

[XT SQL Error]