diff --git a/app/models/signature.rb b/app/models/signature.rb
index 91bb1d816..47408858a 100644
--- a/app/models/signature.rb
+++ b/app/models/signature.rb
@@ -52,7 +52,8 @@ class Signature < ActiveRecord::Base
       verified_at: Time.now,
       erased_at: Time.now,
       password: random_password,
-      terms_of_service: '1'
+      terms_of_service: '1',
+      email: nil
     }
     User.create!(user_params)
   end