fix

app/controllers/competitions/certificates_controller.rb

@@ -13,7 +13,7 @@ class Competitions::CertificatesController < Competitions::BaseController
   def team
     team = CompetitionTeam.find(params[:id])
     return render_forbidden unless team.team_members.exists?(user_id: current_user.id)
-    return render_not_found unless team.certificate_exist?
+    return render_not_found unless team.certificate_exists?
 
     prize = team.competition_prize_users.first.competition_prize
     filename = "#{current_competition.name}-#{prize.name}-#{team.name}.pdf"