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', 'd5c51185741c1c176d196096cc1501af', '3.136.22.50', '1713605586', '1713605586', '/shop_content.php/coID/1')

[XT SQL Error]