1366 - Incorrect integer value: '' for column `wvf_soft_`.`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', '7llgf440hpou1suqd12rj0qic4', '3.235.60.144', '1627456870', '1627456870', '/index.php?cat=c1_.html&XTCsid=7llgf440hpou1suqd12rj0qic4')

[XT SQL Error]