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', '18stjt8esg3b06f09tag5s57r2', '54.166.203.17', '1537468897', '1537468897', '/catalog/product_info.php?products_id=903&osCsid=93nohu804ofirk1ai4u10lbfn1')

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