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', 'esf4mj4dsff24bdop8u832lnq0', '54.224.56.126', '1539886419', '1539886419', '/catalog/product_info.php?products_id=839&osCsid=vmhepl26ib1eao4toa7036vpu0')

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