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', '498f56bf7fbfddf196051195328a2d58', '13.58.252.8', '1713946580', '1713946580', '/advanced_search.php')

[XT SQL Error]