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', 'i8f7dps3oqp4ddvaarg5vfb8i1', '18.119.138.12', '1738997630', '1738997630', '/index.php?XTCsid=nmu1l7bj1113ksvu525rsptc72&cat=c1144_Cyklop-Werkzeug-Akku.html')

[XT SQL Error]