1366 - Incorrect integer value: '' for column `hoc_db9`.`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', 'aa6cd673a4f56d5344382c7bdd04cc28', '3.238.252.196', '1659933552', '1659933552', '/index.php/language/de/cat/c7000_Winteracter-GUI-toolset.html')

[XT SQL Error]