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', 'f5c8c0dc3ed555b586757ced7412e8c0', '216.73.216.0', '1770156730', '1770156730', '/')

[XT SQL Error]