diff --git a/app/controllers/personal_patents_controller.rb b/app/controllers/personal_patents_controller.rb
index 81ffac9..157be02 100644
--- a/app/controllers/personal_patents_controller.rb
+++ b/app/controllers/personal_patents_controller.rb
@@ -31,7 +31,7 @@ class PersonalPatentsController < ApplicationController
       when "language"
           patents_show = patents_temp.select {|value| search_all_words((!value.language.nil? ? t("#{value.language}") : ""), params[:keywords])}
       else
-          patentes_show = patents_temp.select {|value| search_all_words(value.send(params[:selectbox]).to_s, params[:keywords])}
+          patentes_show = patents_temp.select {|value| search_all_words((value.send(params[:selectbox]).to_s rescue ""), params[:keywords])}
       end
       if params[:page_no].nil?
           page_to_show = 1