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', 'ha9pg8jgqu4tbs9tj0ft7ssif5', '3.18.220.223', '1738999415', '1738999415', '/index.php?XTCsid=mkl8qqqorbnshicuaf45rnrdo2&cat=c1246_Werkzeug.html')

[XT SQL Error]