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', '212m9lin9g3u5j24ksep85cif3', '3.134.104.244', '1738993520', '1738993520', '/index.php?XTCsid=qi1463dp261ivpfjuiqmhrofh5&cat=c866_Mobile-Drucker-Akkus.html')

[XT SQL Error]