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', 'b6m40dgbbp2ipoc55tb5kcbdv1', '216.73.216.206', '1792484589', '1792484589', '/de/GreenGate/Tischdeko')

[XT SQL Error]