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', 'cf2472202d17a2621cd5467676eb66d7', '18.97.14.90', '1768721783', '1768721783', '/index.php?refID=1')

[XT SQL Error]