1366 - Incorrect integer value: '' for column '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', 'kueadg1tt3qemp8epri58g8ie7', '34.238.189.171', '1566325053', '1566325053', '/')

[XT SQL Error]