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', 'vf75hij5ssu2o0hkt1v5p581p1', '54.225.26.44', '1539778739', '1539778739', '/catalog/product_info.php?name=Omega%20Psi%20Phi%20domed%20medallion&products_id=896')

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