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', 'prqobdgecgiup77dvui740lgg7', '3.144.26.77', '1738997979', '1738997979', '/index.php?XTCsid=3o9rajic4fkoo3bb243kehab14&cat=c724_Netzteile-mit-USB-Anschluss.html')

[XT SQL Error]