diff --git a/lib/tasks/several_schedules.rake b/lib/tasks/several_schedules.rake
index 759951f7..9c58942e 100644
--- a/lib/tasks/several_schedules.rake
+++ b/lib/tasks/several_schedules.rake
@@ -6,8 +6,8 @@ namespace :data do
   task move_events_attributes: :environment do
     Program.all.each do |program|
       schedule = Schedule.create(program: program)
-      program.selected_schedule = schedule
-      program.save
+      program.selected_schedule = schedule unless program.selected_schedule
+      program.save!
       program.events.each do |event|
         unless event.start_time.nil? && event.room_id.nil?
           # we can not use .room as this relation has been removed