diff --git a/app/views/courses/act_score.json.jbuilder b/app/views/courses/act_score.json.jbuilder
index 394497635..064b13f03 100644
--- a/app/views/courses/act_score.json.jbuilder
+++ b/app/views/courses/act_score.json.jbuilder
@@ -1,7 +1,7 @@
 json.course_members @course_members.each do |member|
-  user = member.user
-  json.user_login user.login
-  json.user_name user.real_name
+  user = User.find_by(id: member.user_id)
+  json.user_login user&.login
+  json.user_name user&.real_name
   # json.course_group member.course_group_name
   json.total_score member.score
 end
\ No newline at end of file