1366 - Incorrect integer value: '' for column `ngtkeZ_web1104_2`.`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', 'sm469ht1odh7r8m66m3o01d355', '216.73.216.14', '1759599038', '1759599038', '/de/GreenGate/Porzellan-Geschirr')

[XT SQL Error]