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', 'cct0hohtc6sko3jaeppjjospp4', '2600:1f28:365:80b0:97f7:bcae:b24c:a081', '1791266120', '1791266120', '/')

[XT SQL Error]