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', '40cb36a74c3c54e4ded6da9d7a8a7955', '216.73.217.140', '1781038346', '1781038346', '/password_double_opt.php')

[XT SQL Error]