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', '2u590bu08i0c20ophjanp6tk91', '54.161.77.30', '1539676491', '1539676491', '/catalog/product_info.php?name=AKA%20Plastic%20License%20Plate%20Frame%20PFWF4301&products_id=510')

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