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', '3713vos1j74la1l3jl9qk61pg5', '18.191.22.207', '1738998473', '1738998473', '/index.php?XTCsid=8e9c41f9ih262sbjeph8l1hut4&cat=c1320_LiFePo4-Akkus.html')

[XT SQL Error]