1054 - Unknown column 'NaN' in 'where clause'

select pov.products_options_values_id, pov.products_options_values_name, pa.options_values_price, pa.price_prefix from products_attributes pa, products_options_values pov where pa.products_id = '11846' and pa.options_id = '57' and pa.options_values_id = pov.products_options_values_id and pov.language_id = '5 ' and pov.products_options_values_id in(874,NaN) order by pa.products_options_sort_order

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