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', '1d921ff3772bf776a301f2f6943e7400', '216.73.217.154', '1788055577', '1788055577', '/')

[XT SQL Error]