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', '281b97ad28353ea01611a50b85fbad73', '216.73.216.113', '1764306143', '1764306143', '/index.php/language/en/cat/c34_Continents.html')

[XT SQL Error]