1366 - Incorrect integer value: '' for column `agentur`.`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', '90cr2nap0eu7ehls2rt5h54736', '18.204.2.231', '1634587499', '1634587499', '/')

[XT SQL Error]