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', '1d88f9b10eb196eb4f284294f0e77e4f', '216.73.216.85', '1752387120', '1752387120', '/')

[XT SQL Error]