1366 - Incorrect integer value: '' for column `CP_as15`.`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', 'iuvq9iod0flm0gi5p2nk18h9p6', '18.216.40.40', '1738995673', '1738995673', '/index.php?XTCsid=3urkhm9sdqaa68rq8ocuqac7t6&cat=c31_Batterien.html')

[XT SQL Error]