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', 'u2f5g9ce3a7n1fm0ud7l3g72d1', '54.161.77.30', '1539680691', '1539680691', '/catalog/product_info.php?name=Kappa%20Alpha%20Psi%20Acrylic%20Medallion%20MED-A%20KAY&products_id=908')

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