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', '5066a9c4f89ef26c33ada92e2b345f04', '18.116.239.195', '1713865527', '1713865527', '/index.php')

[XT SQL Error]