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', '4a61166745d29ed67d0572eccc8d18d2', '54.166.96.191', '1711699073', '1711699073', '/login.php?language=de')

[XT SQL Error]