diff --git a/app/controllers/archives_controller.rb b/app/controllers/archives_controller.rb
index 7ffb05e..47d2165 100644
--- a/app/controllers/archives_controller.rb
+++ b/app/controllers/archives_controller.rb
@@ -340,8 +340,8 @@ F		cats = files_by_cateogry.keys.collect do |cat|
 	end
 	private
 	    def get_sorted_cat_with_filter(categories,cat_type)
-	        all_categories_with_nil = ArchiveCategory.all.in(sort_number: nil).uniq!{|c| c.category_id }.to_a rescue []
-            all_categories_no_nil = ArchiveCategory.all.not_in(sort_number: nil).order_by(sort_number: 'desc').uniq!{|c| c.category_id }.to_a rescue []
+	        all_categories_with_nil = ArchiveCategory.all.in(sort_number: nil).uniq{|c| c.category_id }.to_a rescue []
+            all_categories_no_nil = ArchiveCategory.all.not_in(sort_number: nil).order_by(sort_number: 'desc').uniq{|c| c.category_id }.to_a rescue []
             all_categories_id = all_categories_no_nil.concat(all_categories_with_nil).collect do |cat|
                 cat.category_id.to_s
             end