diff --git a/app/controllers/announcements_controller.rb b/app/controllers/announcements_controller.rb
index a51358d..f91d4d6 100644
--- a/app/controllers/announcements_controller.rb
+++ b/app/controllers/announcements_controller.rb
@@ -44,7 +44,7 @@ class AnnouncementsController < ApplicationController
           "source-site-link" => "",
           "subtitle" => a.subtitle,
           "statuses" => statuses,
-          "category" => a.category.title,
+          "category" => (a.category.title rescue ""),
           "postdate" => a.postdate,
           "author" => author,
           "is_top" => (a.is_top? ? 1 : 0),
@@ -575,7 +575,7 @@ class AnnouncementsController < ApplicationController
       end
     end
 
-    return {} if announcement.category.disable
+    return {} if (announcement.category.disable rescue false)
 
     tags = announcement.tags.map{|tag|  {
       "tag" => tag.name ,
@@ -788,7 +788,7 @@ class AnnouncementsController < ApplicationController
           "source-site-link" => "",
           "subtitle" => a.subtitle,
           "statuses" => statuses,
-          "category" => a.category.title,
+          "category" => (a.category.title rescue ""),
           "postdate" => a.postdate,
           "author" => author,
           "is_top" => (a.is_top? ? 1 : 0),
diff --git a/app/models/bulletin.rb b/app/models/bulletin.rb
index b752a89..1824630 100644
--- a/app/models/bulletin.rb
+++ b/app/models/bulletin.rb
@@ -65,7 +65,8 @@ class Bulletin
   field :open_comment, :type => Boolean, :default => false
   field :comment_end_time, :type => DateTime
   field :comment_role, :type => Array, :default => []
-  
+  field :enable_sub_annc, :type => Boolean, :default => false
+  field :sub_annc_list, :type => Array, :default => []
   mount_uploader :image, ImageUploader
 
   has_many :bulletin_links, :autosave => true, :dependent => :destroy
diff --git a/app/views/announcements/show.html.erb b/app/views/announcements/show.html.erb
index 8627995..a63f2b9 100644
--- a/app/views/announcements/show.html.erb
+++ b/app/views/announcements/show.html.erb
@@ -169,7 +169,7 @@
     <div class="annc-comments-nickname">by <%= comment.account %></div>
     <br>
   </div>
-<% end %>
+<% end rescue nil %>
 <% if action_data['show_comment_flag'] %>
   <div class="annc-comment-div">
     <div data-ph="<%= t('announcement.comment') %>" contenteditable="true" class="announcement-comment"></div>
@@ -177,4 +177,4 @@
       <%= t('announcement.send_comment') %>  
     </button>
   </div>
-<% end %>
\ No newline at end of file
+<% end rescue nil %>
\ No newline at end of file