Fix CSV export

app/controllers/contestants_controller.rb

@@ -114,7 +114,7 @@ class ContestantsController < ApplicationController
     respond_to do |format|
       format.csv do
         response.headers["Content-Type"] = "text/csv"
-        response.headers["Content-Disposition"] = "attachment; filename=#{contest.friendly_id}_results.csv"
+        response.headers["Content-Disposition"] = "attachment; filename=#{@contest.friendly_id}_results.csv"
       end
     end
   end