diff --git a/app/controllers/announcements_controller.rb b/app/controllers/announcements_controller.rb
index f828850..c9d4e6e 100644
--- a/app/controllers/announcements_controller.rb
+++ b/app/controllers/announcements_controller.rb
@@ -9,7 +9,7 @@ class AnnouncementsController < ApplicationController
   end
 
   def manually_sort
-    if defined?(OrbitHelper::SharedHash)
+    if defined?(OrbitHelper::SharedHash) && OrbitHelper::SharedHash['announcement']
       OrbitHelper::SharedHash['announcement'][:enable_manually_sort]
     else
       AnnouncementSetting.first.enable_manually_sort rescue false