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', '932b721e2ac54af76ace771feeb03e4d', '216.73.217.21', '1783522811', '1783522811', '/')

[XT SQL Error]