diff --git a/app/views/weapps/course_member_attendances/index.json.jbuilder b/app/views/weapps/course_member_attendances/index.json.jbuilder
index 01d475e12..765de5833 100644
--- a/app/views/weapps/course_member_attendances/index.json.jbuilder
+++ b/app/views/weapps/course_member_attendances/index.json.jbuilder
@@ -4,7 +4,7 @@
 #   json.student_id member.user&.student_id
 # end
 
-json.member_attendances @members.each_with_index do |member, index|
+json.member_attendances @members.each_with_index.to_a do |member, index|
   json.(member, :user_id)
   json.index (@page.to_i - 1) * @limit.to_i + index + 1
   json.user_name member.user&.real_name