1366 - Incorrect integer value: '' for column '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', 'or2rhabqapf8l7vtj9f0vk7u85', '18.97.14.80', '1745117749', '1745117749', '/xtshop/login.php')

[XT SQL Error]