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', 'vc2d38sfnn62k4da9ij3b4r9i7', '3.147.51.81', '1738999281', '1738999281', '/index.php?XTCsid=3o9rajic4fkoo3bb243kehab14&cat=c640_Netzteile.html')

[XT SQL Error]