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', '59m7scust20do2knp5pr0qrig2', '54.80.96.153', '1537388930', '1537388930', '/catalog/product_info.php?products_id=431&osCsid=gt1atq5aqb0h7n96ma4m8poe36')

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