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', 'o8l5qbotqku25v7huc6n6q2dc7', '3.139.81.114', '1738995086', '1738995086', '/index.php?XTCsid=qg0uqqo4jksa5ns63d51ihq545&cat=c640_Netzteile.html')

[XT SQL Error]