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', 'o4q9ursart20ad9ua8ikmq3451', '3.94.129.211', '1576242173', '1576242173', '/')

[XT SQL Error]