diff --git a/app/helpers/categories_helper.rb b/app/helpers/categories_helper.rb
index df1c9bc80d6cd95eb1f455d12261ab75ca1f113d..cfb31edf2eab4ec8428d8149fc71958cc64e9572 100644
--- a/app/helpers/categories_helper.rb
+++ b/app/helpers/categories_helper.rb
@@ -19,6 +19,8 @@ module CategoriesHelper
                             @post.category
                           elsif defined?(@question) && !@question.category.nil?
                             @question.category
+                          elsif defined?(@article) && !@article.category.nil?
+                            @article.category
                           end
   end
 end