diff --git a/lib/rss_ntu_job.rb b/lib/rss_ntu_job.rb
index e22becff..ae68a2c4 100644
--- a/lib/rss_ntu_job.rb
+++ b/lib/rss_ntu_job.rb
@@ -128,12 +128,12 @@ all.each do |key, value| # Loop through all the authors
         main_bulletin = bulletin.clone
         main_bulletin['_id'] = BSON::ObjectId.new
         main_bulletin[:category_id] = category_id
-        main_bs = @main_coll_bulletin.save(main_bulletin)
+        @main_coll_bulletin.save(main_bulletin)
 
         main_buffer_cat = {  _type: "BufferCategory",
                   category_id: category_id,
                   categorizable_type: "Bulletin",
-                  categorizable_id: main_bs }
+                  categorizable_id: main_bulletin['_id'] }
         @main_coll_buffer_cat.save(main_buffer_cat)
 
         category_id, @copy_categories = get_category_id(bul[:category], @copy_categories, @copy_coll_cat, @copy_bulletin_module_id)
@@ -141,12 +141,11 @@ all.each do |key, value| # Loop through all the authors
         copy_bulletin['_id'] = BSON::ObjectId.new
         copy_bulletin[:category_id] = category_id
         @copy_coll_bulletin.save(copy_bulletin)
-        copy_bs = @copy_coll_bulletin.save(copy_bulletin)
 
         copy_buffer_cat = {  _type: "BufferCategory",
                   category_id: category_id,
                   categorizable_type: "Bulletin",
-                  categorizable_id: copy_bs }
+                  categorizable_id: copy_bulletin['_id'] }
         @copy_coll_buffer_cat.save(copy_buffer_cat)
 
       end