diff --git a/registration/signals.py b/registration/signals.py
index 55a05cd..d282586 100644
--- a/registration/signals.py
+++ b/registration/signals.py
@@ -49,5 +49,5 @@ def update_payment_amount(instance, **_):
     """
     if instance.type == 'free' or instance.type == 'scholarship':
         instance.amount = 0
-    elif instance.pk:
+    elif instance.pk and instance.registrations.exists():
         instance.amount = instance.registrations.count() * instance.tournament.price