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', '6ef88aq3vsv0v2pp3h30tlqp23', '216.73.216.30', '1751840771', '1751840771', '/product_info.php?info=p98_Kerbl-Pferd---Reiter--Katalog-.html')

[XT SQL Error]