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', '289d86f156c5b406d0d96589fb408431', '216.73.217.64', '1781679527', '1781679527', '/')

[XT SQL Error]