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', 'dgih7itkbbhm81qegsvr3ej613', '3.235.179.79', '1623736617', '1623736617', '/')

[XT SQL Error]