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', '1055f5da055208d42a1147d758c7001f', '216.73.216.127', '1773507244', '1773507244', '/')

[XT SQL Error]