1366 - Incorrect integer value: '' for column `hbl_shop`.`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', '323b7f32jsucjv8qhlm54mrte0', '3.148.236.97', '1746786977', '1746786977', '/product_info.php?info=p651_806448-Heizkoerperabdeckung-fuer-150-Liter-Bruehkessel.html')

[XT SQL Error]