diff --git a/app/controllers/question_banks_controller.rb b/app/controllers/question_banks_controller.rb
index 299224527..bf55db9dd 100644
--- a/app/controllers/question_banks_controller.rb
+++ b/app/controllers/question_banks_controller.rb
@@ -240,7 +240,7 @@ class QuestionBanksController < ApplicationController
     ActiveRecord::Base.transaction do
       new_task = GraduationTask.new
       new_task.attributes = task.attributes.dup.except("id", "course_id", "user_id", "quotes", "graduation_task_id",
-                                                       "course_list_id", "gtask_bank_id")
+                                                       "course_list_id", "gtask_bank_id", "created_at", "updated_at")
       new_task.course_id = course.id
       new_task.gtask_bank_id = task.id
       new_task.user_id = current_user.id
@@ -266,7 +266,7 @@ class QuestionBanksController < ApplicationController
     ActiveRecord::Base.transaction do
       new_topic = GraduationTopic.new
       new_topic.attributes = topic.attributes.dup.except("id", "course_id", "user_id", "graduation_topic_id",
-                                                         "course_list_id", "gtopic_bank_id")
+                                                         "course_list_id", "gtopic_bank_id", "created_at", "updated_at")
       new_topic.course_id = course.id
       new_topic.gtopic_bank_id = topic.id
       new_topic.user_id = current_user.id
diff --git a/app/views/courses/index.json.jbuilder b/app/views/courses/index.json.jbuilder
index 94da87af5..1993851e8 100644
--- a/app/views/courses/index.json.jbuilder
+++ b/app/views/courses/index.json.jbuilder
@@ -10,7 +10,7 @@ json.courses do
     json.tasks_count get_tasks_count course
     json.visits course.visits
     json.is_public course.is_public
-    json.is_accessible course.is_public? || @user.course_identity(course) < Course::NORMAL
+    json.is_accessible course.is_public == 1 || @user.course_identity(course) < Course::NORMAL
     json.is_end course.is_end
     json.first_category_url module_url(course.course_modules.first, course)
   end