diff --git a/src/pretix/plugins/paypal/payment.py b/src/pretix/plugins/paypal/payment.py
index 9cefba4c6f..f56874126b 100644
--- a/src/pretix/plugins/paypal/payment.py
+++ b/src/pretix/plugins/paypal/payment.py
@@ -359,7 +359,7 @@ class Paypal(BasePaymentProvider):
             return
 
         if payment.state != 'approved':
-            payment_obj.fail(info=payment)
+            payment_obj.fail(info=payment.to_dict())
             logger.error('Invalid state: %s' % str(payment))
             raise PaymentException(_('We were unable to process your payment. See below for details on how to '
                                      'proceed.'))