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', '74e7a00f35f44d430519481923e97d0c', '216.73.217.21', '1780586439', '1780586439', '/')

[XT SQL Error]