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', '7pdootv9dqorb14no413pps806', '34.207.230.188', '1638293758', '1638293758', '/')

[XT SQL Error]