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', 'hg4oh61q8i0ojca8ht4f9haai4', '18.117.192.253', '1738997139', '1738997139', '/index.php?XTCsid=rkdf8qfiujodbcb5st13ohfmn6&cat=c159_Bosch-Werkzeug-Akku.html')

[XT SQL Error]