fix leaderboard

app/controllers/yiff_rest/api_v2/images_controller.rb

@@ -108,6 +108,7 @@ module YiffRest
       end
 
       def leaderboard
+        @sp = {}
         @list = APIImage.all_seen.sort_by(&:second).reverse.to_h
         @keys = @list.map(&:first)
         @results = APIImage.where(id: @keys).sort_by { |img| @keys.index(img.md5) }