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', 'ggnub5ph3p0je09segp13r6d16', '54.161.77.30', '1539680434', '1539680434', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20Wood%20Medallion%20W-MED&products_id=913')

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