diff --git a/app/controllers/memos_controller.rb b/app/controllers/memos_controller.rb
index 0475eb0da..9d7beb6c1 100644
--- a/app/controllers/memos_controller.rb
+++ b/app/controllers/memos_controller.rb
@@ -3,7 +3,7 @@ class MemosController < ApplicationController
   before_action :set_memo, only: [:show, :edit, :update, :destroy, :sticky_or_cancel, :hidden, :more_reply]
   before_action :validate_memo_params, only: [:create, :update]
   before_action :owner_or_admin, only: [:edit, :update, :destroy]
-  before_action :is_admin, only: [:sticky_or_cancel, :hidden]
+  before_action :require_business, only: [:sticky_or_cancel, :hidden]
 
   include ApplicationHelper
   # GET /memos
@@ -132,7 +132,7 @@ class MemosController < ApplicationController
   def hidden
     tip_exception("不能对主贴进行隐藏操作") if @memo.parent_id.nil?
     begin
-      @memo.update_attributes!(hidden: !@memo.hidden)
+      @memo.update_attributes!(hidden: @memo.hidden == 0 ? 1 : 0)
       normal_status("更新成功")
     rescue Exception => e
       tip_exception("更新失败，原因：#{e}")
@@ -182,10 +182,6 @@ class MemosController < ApplicationController
     tip_exception(403, "无权限操作") unless @memo.author == current_user || current_user.admin? || current_user.business?
   end
 
-  def is_admin
-    tip_exception(403, "无权限操作") unless current_user.admin? || current_user.business?
-  end
-
   # Never trust parameters from the scary internet, only allow the white list through.
   def memo_params
     params.require(:memo).permit(:subject, :content, :forum_id)
diff --git a/app/decorators/tiding_decorator.rb b/app/decorators/tiding_decorator.rb
index c9ad806ee..677812217 100644
--- a/app/decorators/tiding_decorator.rb
+++ b/app/decorators/tiding_decorator.rb
@@ -2,6 +2,9 @@ module TidingDecorator
   def content
     method_name = "#{container_type.underscore}_content"
     respond_to?(method_name) ? send(method_name) : ''
+  rescue => ex
+    Util.logger_error(ex)
+    ''
   end
 
   def how_long_time
@@ -261,16 +264,16 @@ module TidingDecorator
   def journal_content
     case tiding_type
     when 'Mentioned' then
-      I18n.t(locale_format(tiding_type)) % message_content_helper(container.notes)
+      I18n.t(locale_format(tiding_type)) % message_content_helper(container&.notes)
     when 'Comment' then
-      I18n.t(locale_format(tiding_type, container.parent.present?)) % message_content_helper(container.notes)
+      I18n.t(locale_format(tiding_type, container.parent.present?)) % message_content_helper(container&.notes)
     else
-      I18n.t(locale_format) % container.issue.subject
+      I18n.t(locale_format) % container&.issue&.subject
     end
   end
 
   def issue_content
-    I18n.t(locale_format) % container.subject
+    I18n.t(locale_format) % container&.subject
   end
 
   def pull_request_content
@@ -291,15 +294,15 @@ module TidingDecorator
   end
 
   def poll_content
-    I18n.t(locale_format(parent_container_type)) % container.polls_name
+    I18n.t(locale_format(parent_container_type)) % container&.polls_name
   end
 
   def exercise_content
-    I18n.t(locale_format(parent_container_type)) % container.exercise_name
+    I18n.t(locale_format(parent_container_type)) % container&.exercise_name
   end
 
   def student_graduation_topic_content
-    I18n.t(locale_format) % container.graduation_topic.try(:name)
+    I18n.t(locale_format) % container&.graduation_topic.try(:name)
   end
 
   def deal_student_topic_select_content
@@ -307,27 +310,27 @@ module TidingDecorator
   end
 
   def graduation_task_content
-    I18n.t(locale_format(parent_container_type)) % container.name
+    I18n.t(locale_format(parent_container_type)) % container&.name
   end
 
   def graduation_work_content
-    I18n.t(locale_format(extra.nil?)) % container.graduation_task.try(:name)
+    I18n.t(locale_format(extra.nil?)) % container&.graduation_task.try(:name)
   end
 
   def graduation_work_score_content
-    I18n.t(locale_format) % container.graduation_work.graduation_task.try(:name)
+    I18n.t(locale_format) % container&.graduation_work&.graduation_task.try(:name)
   end
 
   def homework_common_content
-    I18n.t(locale_format(parent_container_type), name: container.name, reason: extra)
+    I18n.t(locale_format(parent_container_type), name: container&.name, reason: extra)
   end
 
   def student_work_content
-    I18n.t(locale_format(extra.nil?)) % container.homework_common.try(:name)
+    I18n.t(locale_format(extra.nil?)) % container&.homework_common.try(:name)
   end
 
   def student_works_score_content
-    I18n.t(locale_format(extra)) % container.student_work.homework_common.try(:name)
+    I18n.t(locale_format(extra)) % container&.student_work&.homework_common.try(:name)
   end
 
   def challenge_work_score_content
diff --git a/dump.rdb b/dump.rdb
index a799840b1..4687968bd 100644
Binary files a/dump.rdb and b/dump.rdb differ