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', 'o94i92umohldujfr89n6c2grd3', '3.228.10.64', '1603254596', '1603254596', '/')

[XT SQL Error]