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', '99i0vuntutn56rbj8do2qnn1g1', '54.156.39.245', '1539611213', '1539611213', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20Mirror%20Rectangle%20Keychain%20MRK&products_id=926')

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