fix field error

app/models/seminar_signup_field.rb

@@ -47,7 +47,8 @@ class SeminarSignupField
   end
 
   def locale
-    get_data["cross_lang"] == "true" ? false : true
+    tmp = get_data
+    !tmp || get_data["cross_lang"] == "true" ? false : true
   end
 
   def self_defined_markup_options?

app/views/seminars/show_privacy.html.erb

@@ -19,7 +19,7 @@
 
 <div class="highlight seminar_privacy">
 
-<%= @seminar_agreement.content.html_safe %>
+<%= @seminar_agreement.content.html_safe rescue '' %>
 
 </div>