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', 'r3j65njlg3r4oq5meqsg7ph970', '3.89.87.12', '1603937342', '1603937342', '/')

[XT SQL Error]