diff --git a/app/models/seminar_signup_field_custom.rb b/app/models/seminar_signup_field_custom.rb
index 658cc5e..baa6a2a 100644
--- a/app/models/seminar_signup_field_custom.rb
+++ b/app/models/seminar_signup_field_custom.rb
@@ -6,6 +6,6 @@ class SeminarSignupFieldCustom
   field :hidden, type: Boolean, default: true
   belongs_to :seminar_main
   def seminar_signup_field
-	SeminarSignupField.find(self.seminar_signup_field_id) rescue nil
+    SeminarSignupField.find(self.seminar_signup_field_id) rescue nil
   end
 end
diff --git a/app/views/admin/seminars/_get_display_fields.html.erb b/app/views/admin/seminars/_get_display_fields.html.erb
index 35cc0f4..54e84db 100644
--- a/app/views/admin/seminars/_get_display_fields.html.erb
+++ b/app/views/admin/seminars/_get_display_fields.html.erb
@@ -30,8 +30,8 @@
     <% end %>
     <% if @seminar.seminar_signup_field_customs.count != 0 %>
         <% @seminar.seminar_signup_field_customs.each do |field_set| %>
-            <% s = SeminarSignupField.where(id:field_set.seminar_signup_field_id).first %>
-            <% next if s.key.blank? %>
+            <% s = field_set.seminar_signup_field %>
+            <% next if (s.nil? || s.key.blank?) %>
             <% default_hidden << "seminar_signup_field_custom.#{s.key}" if (field_set.hidden) %>
         <% end %>
     <% end %>
@@ -113,7 +113,8 @@
     <% seminar_signup_field_customs = SeminarSignupFieldCustom.all.map{|field_set| SeminarSignupField.where(id: field_set.seminar_signup_field_id).first}.select{|s| !s.nil?}.uniq{|s| s.key } %>
     <% if seminar_signup_field_customs.count != 0 %>
         <% seminar_signup_field_customs.each do |s| %>
-            <% next if s.key.blank? %>
+            <% s = field_set.seminar_signup_field %>
+            <% next if (s.nil? || s.key.blank?) %>
             <% default_hidden << "seminar_signup_field_custom.#{s.key}" if (field_set.hidden) %>
         <% end %>
     <% end %>
diff --git a/app/views/admin/seminars/export.xlsx.axlsx b/app/views/admin/seminars/export.xlsx.axlsx
index 15b7269..cee1dd2 100644
--- a/app/views/admin/seminars/export.xlsx.axlsx
+++ b/app/views/admin/seminars/export.xlsx.axlsx
@@ -55,10 +55,10 @@ wb.add_worksheet(name: (@seminar.title.to_s[0..27]+'...')) do |sheet|
     @seminar.seminar_signup_fields.asc(:_id).each  do |rf| 
       if rf.can_muti_lang_input?
         @site_in_use_locales.each do |l|
-          row2 << nl2br(show_attribute_value(@seminar.get_attribute_value(rf,signup.id).get_value_by_locale(l))) rescue ' '
+          row2 << (@seminar.get_attribute_value(rf,signup.id).get_value_by_locale(l) rescue '')
         end
       else
-        row2 << nl2br(show_attribute_value(@seminar.get_attribute_value(rf,signup.id).get_value_by_locale(I18n.locale))) rescue ' '
+        row2 << (@seminar.get_attribute_value(rf,signup.id).get_value_by_locale(I18n.locale) rescue '')
       end
     end
     types = (0...row2.count).map{|i| types[i]}