1366 - Incorrect integer value: '' for column `mapshopatlogis`.`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', 'c9821c49af5f0eb938d8a8b461b4cb3a', '216.73.216.80', '1764678263', '1764678263', '/index.php/language/de/cat/c8_Reliefkarten-Poster.html')

[XT SQL Error]