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', '6g1qn09i42ejilpqgft44jveh5', '216.73.216.154', '1761889207', '1761889207', '/product_info.php?info=p562_805784-Ersatzmesser-fuer-Schrotmuehle-AMA-50.html')

[XT SQL Error]