1366 - Incorrect integer value: '' for column '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', '86d68e9a9c1f849c49eb878f3da6ee30', '3.93.162.26', '1711725496', '1711725496', '/product_info.php/info/p6_Sommerhonig-Linde.html')

[XT SQL Error]