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', 'oc1cdudc0asqs5hetp8t9ihvv7', '3.144.149.217', '1746934428', '1746934428', '/product_info.php?info=p636_806279-Heizstababdeckung-fuer-80--100-Liter-Bruehkessel.html')

[XT SQL Error]