diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index d99c59c85..e20a8bd28 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -816,7 +816,7 @@ class ExercisesController < ApplicationController
 
           ex_user_ids = exercise_users.pluck(:id)
 
-          EndExerciseCalculateJob.perform_later(ex_user_ids, exercise, Time.now.to_s, true, 4)
+          EndExerciseCalculateJob.perform_later(ex_user_ids, exercise.id, Time.now.to_s, true, 4)
           # exercise_users.each do |user|
           #   if user.commit_status == 0 && user.start_at.present?
           #     objective_score = calculate_student_score(exercise,user.user)[:total_score]
@@ -1194,7 +1194,7 @@ class ExercisesController < ApplicationController
         start_time = Time.current - @exercise.time * 60
         ex_user_ids = @exercise_users_list.where("start_at <= '#{Time.at(start_time)}' and commit_status = 0").pluck(:id)
         if ex_user_ids.size > 0
-          EndExerciseCalculateJob.perform_later(ex_user_ids, @exercise, Time.now.to_s, false, 2)
+          EndExerciseCalculateJob.perform_later(ex_user_ids, @exercise.id, Time.now.to_s, false, 2)
         end
       end
 
diff --git a/app/jobs/end_exercise_calculate_job.rb b/app/jobs/end_exercise_calculate_job.rb
index 28f1f6901..3354be2d5 100644
--- a/app/jobs/end_exercise_calculate_job.rb
+++ b/app/jobs/end_exercise_calculate_job.rb
@@ -5,7 +5,9 @@ class EndExerciseCalculateJob < ApplicationJob
 
   queue_as :default
 
-  def perform(ex_user_ids,exercise,end_time,work_time,commit_method)
+  def perform(ex_user_ids,exercise_id,end_time,work_time,commit_method)
+    exercise = Exercise.find_by(id: exercise_id)
+    return if exercise.blank?
     exercise_users = ExerciseUser.where(id: ex_user_ids)
     exercise_users.each do |user|
       if user.commit_status == 0 && user.start_at.present?