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', 'at3gpvut1eofjcp3b7f59sr903', '3.149.2.199', '1746999655', '1746999655', '/product_info.php?info=p655_806088-Reihenzieher-Furchenzieher--100-cm.html')

[XT SQL Error]