diff --git a/lib/tasks/homework_evaluation.rake b/lib/tasks/homework_evaluation.rake
index 757b07877..f6ae7edf3 100644
--- a/lib/tasks/homework_evaluation.rake
+++ b/lib/tasks/homework_evaluation.rake
@@ -17,7 +17,7 @@ namespace :homework_evaluation do
     homework_detail_manuals.each do |homework_detail_manual|
       homework_common = homework_detail_manual.homework_common
       if homework_common.anonymous_comment
-        if homework_common.homework_group_settings.where("end_time is null or end_time > '#{Time.now}'").count == 0
+        if homework_common.homework_group_settings.where("end_time > '#{Time.now}'").count == 0
           if homework_common.homework_type == "group"
             student_works = homework_common.student_works.where("work_status != 0").group(:group_id)
           else