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', '47c06aad3520a9ab01fd6b3ab092dd1a', '34.239.151.124', '1718723284', '1718723284', '/login.php')

[XT SQL Error]