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', '59aaa7bf954fa8bfe77e95f60a56eed1', '216.73.216.169', '1771788272', '1771788272', '/')

[XT SQL Error]