1366 - Incorrect integer value: '' for column `magickland`.`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', 'sn9dlfhj0a0p1r1drr2195gli2', '3.128.30.217', '1718733647', '1718733647', '/index.php/cat/templates/xtc5/stylesheet.css')

[XT SQL Error]