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', '23o6hno38e2psfuim02c1k0ie6', '18.219.81.99', '1746770100', '1746770100', '/index.php?cat=c7_Wasserpumpe-Kalkspritzen.html')

[XT SQL Error]