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', '9vvtfc0m02lb08j9tkj8bujol4', '3.22.120.195', '1746783663', '1746783663', '/product_info.php?info=p495_804480-Kartoffeldaempfer-Futterdaempfer-100-Liter--Festbrennstoffe.html')

[XT SQL Error]