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', 'tnci4ue186nrfmi0553t35ipv7', '18.206.177.17', '1619110613', '1619110613', '/')

[XT SQL Error]