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', '8aa877e23795b499444a6e4194351b98', '44.221.73.157', '1718261110', '1718261110', '/')

[XT SQL Error]