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', 'cb1tt7dfnpjf5dbo6s7ftphbv4', '18.97.9.170', '1742532799', '1742532799', '/index.php?cat=c1_Futterdaempfer-Holz-Kohle.html')

[XT SQL Error]