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', '3dc0da19d0316aa5d65b70a18f18a249', '216.73.216.187', '1789175478', '1789175478', '/')

[XT SQL Error]