fixes #2208

app/models/bulk_update_request.rb

@@ -39,8 +39,10 @@ class BulkUpdateRequest < ActiveRecord::Base
   end
 
   def create_forum_topic
-    forum_topic = ForumTopic.create(:title => "[bulk] #{title}", :category_id => 1, :original_post_attributes => {:body => reason_with_link})
-    update_attribute(:forum_topic_id, forum_topic.id)
+    unless forum_topic_id
+      forum_topic = ForumTopic.create(:title => "[bulk] #{title}", :category_id => 1, :original_post_attributes => {:body => reason_with_link})
+      update_attribute(:forum_topic_id, forum_topic.id)
+    end
   end
 
   def reason_with_link

app/views/bulk_update_requests/_form.html.erb

@@ -20,6 +20,7 @@ mass update aaa -> bbb
     <%= dtext_field "bulk_update_request", "reason", :name => "Reason" %>
   </div>
 
+  <%= f.input :forum_topic_id, :hint => " (optional)" %>
   <%= f.button :submit, :value => "Submit" %>
   <%= dtext_preview_button "bulk_update_request", "reason" %>
 <% end %>