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', '512be5b313a6b4d9ea1e5b17233de1a3', '216.73.217.17', '1792359516', '1792359516', '/')

[XT SQL Error]