diff --git a/app/controllers/graduation_topics_controller.rb b/app/controllers/graduation_topics_controller.rb
index 32823ab9..d55638df 100644
--- a/app/controllers/graduation_topics_controller.rb
+++ b/app/controllers/graduation_topics_controller.rb
@@ -106,7 +106,7 @@ class GraduationTopicsController < ApplicationController
   def student_select_topic
     if User.current.student_graduation_topics.where(:course_id => @course.id, :status => [0, 1]).count == 0
       @topic.student_graduation_topics << StudentGraduationTopic.new(:course_id => @course.id, :user_id => User.current.id,
-                                                                     :member_id => @course.members.where(:user_id => User.current.id).first.try(:id))
+                                                                     :member_id => @course.course_members.where(:user_id => current_user.id).first.try(:id))
       @topic.update_attributes(:status => 1)
     end
     redirect_to graduation_topic_path(@topic)