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', '4c1c80a81886c0c19e2752b9bccdd16f', '216.73.216.212', '1770666029', '1770666029', '/')

[XT SQL Error]