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', '287068f72c7c7b228be60004ffce4387', '3.145.93.210', '1714066968', '1714066968', '/password_double_opt.php?language=de')

[XT SQL Error]