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', 'f993dce77e4bf809eec00a40aa67dd9b', '18.222.179.186', '1714159597', '1714159597', '/account.php')

[XT SQL Error]