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', '32564c760713b57bafec45739d8c7238', '3.144.86.134', '1714072622', '1714072622', '/address_book.php')

[XT SQL Error]