diff --git a/app/models/registration.rb b/app/models/registration.rb
index f7c032ea..bc1fbd8a 100644
--- a/app/models/registration.rb
+++ b/app/models/registration.rb
@@ -31,7 +31,7 @@ class Registration < ApplicationRecord
   validate :registration_to_events_only_if_present
 
   validates :accepted_code_of_conduct, acceptance: {
-    if: -> { conference.code_of_conduct.present? }
+    if: -> { conference.try(:code_of_conduct).present? }
   }
 
   after_create :set_week, :subscribe_to_conference, :send_registration_mail