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', 'r0cl2nmt56k08in322ibc2l3l2', '18.118.252.210', '1738999203', '1738999203', '/index.php?XTCsid=rkdf8qfiujodbcb5st13ohfmn6&cat=c710_LED-Leuchtmittel.html')

[XT SQL Error]