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', '5afgnnl1pqoct14i14he0pokp6', '18.218.230.170', '1738998725', '1738998725', '/index.php?XTCsid=rkdf8qfiujodbcb5st13ohfmn6&cat=c841_Li-ion-3-6V---3-7V-Rundzellen.html')

[XT SQL Error]