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', '306f9c5f9e93f6e13ff408bf594dc325', '216.73.217.140', '1781038666', '1781038666', '/')

[XT SQL Error]