1366 - Incorrect integer value: '' for column `usr_web74_1`.`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', '0n0n9ihu464da47feila8sl1p4', '216.73.216.106', '1764911809', '1764911809', '/index.php?cat=c15_Rhythmusinstrumente.html')

[XT SQL Error]