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', 'b083e836a9f9dc7edbb49d2ec171d21f', '216.73.216.53', '1752094063', '1752094063', '/index.php/language/en/refID/1/cat/c19_Reliefkarten-Digital.html')

[XT SQL Error]