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', '97371a6c4517c16b3e1d2b15bdcb2e35', '216.73.216.212', '1771528839', '1771528839', '/')

[XT SQL Error]