diff --git a/app/jobs/create_student_work_job.rb b/app/jobs/create_student_work_job.rb
index 1fd9a9b00..18e472b3a 100644
--- a/app/jobs/create_student_work_job.rb
+++ b/app/jobs/create_student_work_job.rb
@@ -14,7 +14,9 @@ class CreateStudentWorkJob < ApplicationJob
       student_ids = course.students.pluck(:user_id)
 
       student_ids.each do |user_id|
-        worker.add same_attrs.merge(user_id: user_id)
+        unless StudentWork.where(user_id: user_id, homework_common_id: homework.id).exists?
+          worker.add same_attrs.merge(user_id: user_id)
+        end
       end
     end
   end