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', '33798b9cdcf475ed6d7f1e6514a76788', '216.73.216.61', '1772148449', '1772148449', '/')

[XT SQL Error]