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', '8rlro0ntjvqeciapol1gk1ojk2', '34.204.171.108', '1571871824', '1571871824', '/')

[XT SQL Error]