diff --git a/app/assets/javascripts/personal_journal/author.js.erb b/app/assets/javascripts/personal_journal/author.js.erb
index 66289d2..c53e18f 100644
--- a/app/assets/javascripts/personal_journal/author.js.erb
+++ b/app/assets/javascripts/personal_journal/author.js.erb
@@ -6,7 +6,7 @@
         var on = $('.language-nav li.active').index();
         var le = $(this).parent('.add-btn-box').prev('.add-target-box').children('.start-line').length;
         $(this).prev().attr('value', parseInt(new_id) + 1);
-        $(this).parent().siblings('.add-target-box').append(("<%= escape_javascript(add_attribute 'form_author', f, :journal_paper_authors) %>").replace(old_id, new_id));
+        $(this).parent().siblings('.add-target-box').append(("<%= escape_javascript(add_attribute 'form_author', (f rescue nil), :journal_paper_authors) %>").replace(old_id, new_id));
         $(this).parent('.add-btn-box').prev('.add-target-box').children('.start-line').eq(le).children('.input-append').find('.tab-content').each(function() {
           $(this).children('.tab-pane').eq(on).addClass('in active').siblings().removeClass('in active');
         });