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', '8217s36745ptb77ggfd0bm6ft5', '54.92.160.119', '1539831726', '1539831726', '/catalog/product_info.php?products_id=640&osCsid=4p94pa41m1g9rrgemqkqhurat0')

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