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', 'fpgaq9g3je98eolotro92aaip1', '3.145.158.111', '1738998979', '1738998979', '/index.php?XTCsid=8e9c41f9ih262sbjeph8l1hut4&cat=c215_Black---Decker-Werkzeug-Akku.html')

[XT SQL Error]