diff --git a/app/helpers/polls_helper.rb b/app/helpers/polls_helper.rb
index b5ba79dcc..d9b6ccee7 100644
--- a/app/helpers/polls_helper.rb
+++ b/app/helpers/polls_helper.rb
@@ -110,7 +110,7 @@ module PollsHelper
       poll_user_name = user.nickname
     end
     course_member = course_members.find_by(user_id:user.id)
-    course_group_id = course_members.present? ? course_member.course_group_id : nil
+    course_group_id = course_member.present? ? course_member.course_group_id : nil
     if course_group_id == 0
       course_group_name = "未分班"
     else