diff --git a/app/jobs/course_add_student_create_works_job.rb b/app/jobs/course_add_student_create_works_job.rb
index d8bd6363c..fec28f395 100644
--- a/app/jobs/course_add_student_create_works_job.rb
+++ b/app/jobs/course_add_student_create_works_job.rb
@@ -25,7 +25,7 @@ class CourseAddStudentCreateWorksJob < ApplicationJob
       student_ids.each do |user_id|
         same_attrs = {user_id: user_id}
         course.homework_commons.where(homework_type: %i[normal group practice]).each do |homework|
-          next if homework.student_works.where(user_id: user_id).any?
+          next if StudentWork.where(user_id: user_id, homework_common_id: homework.id).any?
           worker.add same_attrs.merge(homework_common_id: homework.id)
         end
       end
@@ -36,7 +36,7 @@ class CourseAddStudentCreateWorksJob < ApplicationJob
       student_ids.each do |user_id|
         same_attrs = {user_id: user_id}
         course.exercises.each do |exercise|
-          next if exercise.exercise_users.where(user_id: user_id).any?
+          next if ExerciseUser.where(user_id: user_id, exercise_id: exercise.id).any?
           worker.add same_attrs.merge(exercise_id: exercise.id)
         end
       end
@@ -47,7 +47,7 @@ class CourseAddStudentCreateWorksJob < ApplicationJob
       student_ids.each do |user_id|
         same_attrs = {user_id: user_id}
         course.polls.each do |poll|
-          next if poll.poll_users.where(user_id: user_id).any?
+          next if PollUser.where(user_id: user_id, poll_id: poll.id).any?
           worker.add same_attrs.merge(poll_id: poll.id)
         end
       end
@@ -58,7 +58,7 @@ class CourseAddStudentCreateWorksJob < ApplicationJob
       student_ids.each do |user_id|
         same_attrs = {user_id: user_id, course_id: course.id}
         course.graduation_tasks.each do |task|
-          next if task.graduation_works.where(user_id: user_id).any?
+          next if GraduationWork.where(user_id: user_id, graduation_task_id: task.id).any?
           worker.add same_attrs.merge(graduation_task_id: task.id)
         end
       end