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', 'jafq0hc75f4prctto5s5ru7382', '18.116.20.44', '1747109186', '1747109186', '/product_info.php?info=p636_806279-Heizkoerperabdeckung-fuer-Bruehkessel-100-Liter.html')

[XT SQL Error]