diff --git a/lib/tasks/competition_extra_course_statistic.rake b/lib/tasks/competition_extra_course_statistic.rake
index 724e53ca2..76cc706b3 100644
--- a/lib/tasks/competition_extra_course_statistic.rake
+++ b/lib/tasks/competition_extra_course_statistic.rake
@@ -25,6 +25,8 @@ namespace :competition do
 
     users = User.joins(:user_extension).where(id: user_ids).where(user_extensions: {identity: 0})
 
+    competition.competition_teams.destroy_all
+
     users.each do |user|
       team = CompetitionTeam.create!(competition_id: competition.id, user_id: user.id, name: user.real_name)
       TeamMember.create!(competition_team_id: team.id, user_id: user.id, role: 1, competition_id: competition.id)