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', 'tbk4rp7lerj08sgr747gtj4u37', '3.148.240.60', '1748375413', '1748375413', '/product_info.php?info=p629_800383-Schlammsieb-fuer-E-Futterdaempfer-160-Liter.html')

[XT SQL Error]