1366 - Incorrect integer value: '' for column `ngtkeZ_web1104_2`.`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', '2vsr1lhk91t0heo8lo4c1rf0r3', '18.212.87.137', '1711646255', '1711646255', '/shopping_cart.php')

[XT SQL Error]