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', 'nke04uojm514586f11vov58186', '100.26.135.252', '1711704550', '1711704550', '/login.php?XTCsid=nke04uojm514586f11vov58186')

[XT SQL Error]