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', '8ef7a3553968517896ca936620e78d37', '216.73.216.110', '1768359895', '1768359895', '/index.php/cat/c42_Vector-Maps.html')

[XT SQL Error]