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', 'lk4hq7413laju40rm6kgofn911', '3.144.17.93', '1746792208', '1746792208', '/product_info.php?info=p612_806101-Bauschubkarrenrad-mit-Achse--Komplettset.html')

[XT SQL Error]