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', '9eb30a0d6a06be0859a8c91f3a25f1fb', '216.73.216.202', '1790059819', '1790059819', '/')

[XT SQL Error]