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', '5vplf13ap2ek6q4lig9ec5atp2', '3.15.156.140', '1713885626', '1713885626', '/login.php?XTCsid=5vplf13ap2ek6q4lig9ec5atp2')

[XT SQL Error]