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', '700f66c524c35b355024766dd27ad751', '216.73.216.143', '1762661239', '1762661239', '/index.php/language/de/cat/c34_Continents.html')

[XT SQL Error]