fix

alkatorapi/views.py

@@ -241,6 +241,7 @@ def payment_result(request):
         return HttpResponse(status=400)
     try:
         invoice = Invoice.objects.get(invoice_id=ref_id)
+        user = invoice.user
     except Invoice.DoesNotExist:
         mail_admins('Chyba s platbou!', f'invoice_id={ref_id}&paid={paid}')
         return HttpResponse(status=404)