diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index e73786f58ba..648c9b0912f 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -339,8 +339,9 @@ class ApplicationController < ActionController::Base
     end
 
     def build_not_found_page(status=404, layout=false)
-      @top_viewed = Topic.top_viewed(10)
-      @recent = Topic.recent(10)
+      category_topic_ids = Category.pluck(:topic_id).compact
+      @top_viewed = Topic.where.not(id: category_topic_ids).top_viewed(10)
+      @recent = Topic.where.not(id: category_topic_ids).recent(10)
       @slug =  params[:slug].class == String ? params[:slug] : ''
       @slug =  (params[:id].class == String ? params[:id] : '') if @slug.blank?
       @slug.gsub!('-',' ')