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', 'eaiubdfqtv417to1rjjkdhui46', '34.229.97.16', '1553236138', '1553236138', '/')

[XT SQL Error]