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', 'ogse7kf837u8e2g91djv8l35n6', '3.144.93.10', '1738997955', '1738997955', '/index.php?XTCsid=rkdf8qfiujodbcb5st13ohfmn6&cat=c998_Makita-36Volt-Akku.html')

[XT SQL Error]