diff --git a/app/models/todos/undone_todos_query.rb b/app/models/todos/undone_todos_query.rb
index 18a630ac..2ba2571c 100644
--- a/app/models/todos/undone_todos_query.rb
+++ b/app/models/todos/undone_todos_query.rb
@@ -27,7 +27,7 @@ module Todos
 
       if params[:tag]
         tag = Tag.where(:name => params[:tag]).first
-       if not tag
+       return [] if !tag
          return []
        end
         not_done_todos = not_done_todos.joins(:taggings).where('taggings.tag_id = ?', tag.id)