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', '8be233d199d9798a60678f69937616fb', '18.221.141.44', '1714079054', '1714079054', '/index.php')

[XT SQL Error]