diff --git a/app/controllers/personal_journals_controller.rb b/app/controllers/personal_journals_controller.rb
index 9791270..5a79635 100644
--- a/app/controllers/personal_journals_controller.rb
+++ b/app/controllers/personal_journals_controller.rb
@@ -37,7 +37,7 @@ class PersonalJournalsController < ApplicationController
       when "author_type"
           journal_papers_show = journal_papers_temp.select {|value| search_all_words(value.journal_paper_author_types.collect{|jat| jat.title}.join(", "), params[:keywords])}
       when "paper_type"
-          journal_papers_show = journal_papers_temp.select {|value| search_all_words(value.journal_paper_type.title.to_s, params[:keywords])}
+          journal_papers_show = journal_papers_temp.select {|value| search_all_words((value.journal_paper_type.title rescue ""), params[:keywords])}
       when "language"
           journal_papers_show = journal_papers_temp.select {|value| search_all_words((!value.language.nil? ? t("#{value.language}") : ""), params[:keywords])}
       else