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', 'c1qtu4stvditr2s7mvb8e12mn7', '3.19.61.127', '1738995366', '1738995366', '/index.php?XTCsid=qi1463dp261ivpfjuiqmhrofh5&cat=c825_Modellbau-Akkus.html')

[XT SQL Error]