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', '2knhi62vbhn3qut2nv7fo586g4', '54.156.39.245', '1539606168', '1539606168', '/catalog/product_info.php?name=Zeta%20Phi%20Beta%20Plastic%20License%20Plate%20Holder-%20PFB_4004&products_id=570')

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