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', '14a2q86uoumv6d9e6kk6n9rdc6', '3.21.113.43', '1738995881', '1738995881', '/index.php?XTCsid=8km4iag7d9anolhh9c02p13aq2&cat=c31_Batterien.html')

[XT SQL Error]