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', 'm34cu88j1a8s90rpnk3t22bpj0', '3.235.101.50', '1601421482', '1601421482', '/shop_content.php?coID=7')

[XT SQL Error]