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', 'use8nqlv7ju07pm3m02pi1v4t7', '54.156.39.245', '1539737025', '1539737025', '/catalog/product_info.php?products_id=431&osCsid=s3dc3tpt9roues6qdm074j46e1')

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