1366 - Incorrect integer value: '' for column `pella-ware`.`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', '907293f61282edda520888d8f8139042', '18.218.129.100', '1713936580', '1713936580', '/index.php?language=de')

[XT SQL Error]