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', '8c06tnjei8vuum9np080r8gja1', '18.188.209.71', '1738996260', '1738996260', '/index.php?XTCsid=8km4iag7d9anolhh9c02p13aq2&cat=c640_Netzteile.html')

[XT SQL Error]