1366 - Incorrect integer value: '' for column `shop_db3`.`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', '89432de5b076eaefbff1539d6e903561', '3.21.104.109', '1714140156', '1714140156', '/product_info.php?language=de&info=p248_Memory-Of-Spain.html&XTCsid=8431cc383ca4da55e69d814d1f9a8725')

[XT SQL Error]