diff --git a/app/controllers/personal_journals_controller.rb b/app/controllers/personal_journals_controller.rb
index e6362c0..60551bc 100644
--- a/app/controllers/personal_journals_controller.rb
+++ b/app/controllers/personal_journals_controller.rb
@@ -37,7 +37,7 @@ class PersonalJournalsController < ApplicationController
       when "level_type"
           journal_papers_show = journal_papers_temp.select {|value| search_all_words(value.journal_levels.collect{|x| x.title}.join(', ').to_s, params[:keywords])}
       when "publication_date"
-          journal_papers_show = journal_papers_temp.select {|value| search_all_words(value.send("publication_date").strftime("%Y/%m/%d") rescue "", params[:keywords])}
+          journal_papers_show = journal_papers_temp.select {|value| (search_all_words(value.send("publication_date").strftime("%Y/%m/%d") rescue ""), params[:keywords])}
       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 "language"