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', 'i088vk41kl8godp0igmbq22gq0', '3.139.236.174', '1738999231', '1738999231', '/index.php?XTCsid=3o9rajic4fkoo3bb243kehab14&cat=c1012_Geschenkidee.html')

[XT SQL Error]