diff --git a/app/models/payment_infos/qr_bill.rb b/app/models/payment_infos/qr_bill.rb
index fa07a90d..7aea118a 100644
--- a/app/models/payment_infos/qr_bill.rb
+++ b/app/models/payment_infos/qr_bill.rb
@@ -71,7 +71,7 @@ def debitor_address_lines
     end
 
     def creditor_account
-      organisation.iban.presence
+      organisation.iban.to_s.presence
     end
 
     def currency