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', 'a1tb85k3j7nft2n95qe4i4uop3', '3.138.111.28', '1738994372', '1738994372', '/index.php?XTCsid=qi1463dp261ivpfjuiqmhrofh5&cat=c641_Ladeger--te.html')

[XT SQL Error]