diff --git a/app/controllers/form_controller.rb b/app/controllers/form_controller.rb
index 537c94701..f95f84667 100644
--- a/app/controllers/form_controller.rb
+++ b/app/controllers/form_controller.rb
@@ -24,7 +24,7 @@ class FormController < ApplicationController
     else
       render_not_found
     end
-    transaction.finish
+    transaction.finish if transaction
   end
 
   def check_answers