1366 - Incorrect integer value: '' for column `pella-ware`.`whos_online`.`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', '3121389e1fb0c968ef0b86ea8d02c162', '216.73.216.41', '1757041146', '1757041146', '/')

[XT SQL Error]