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', '0gqobjajlg3751srki4idf4o95', '54.156.51.193', '1537311381', '1537311381', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20Wood%20Laser%20Engraved%20keychain%20WKLE&products_id=920')

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