diff --git a/nodeconductor/cost_tracking/serializers.py b/nodeconductor/cost_tracking/serializers.py
index <HASH>..<HASH> 100644
--- a/nodeconductor/cost_tracking/serializers.py
+++ b/nodeconductor/cost_tracking/serializers.py
@@ -132,7 +132,10 @@ def get_price_estimate_for_project(serializer, project):
     try:
         estimate = models.PriceEstimate.objects.get(scope=project, year=now.year, month=now.month)
     except models.PriceEstimate.DoesNotExist:
-        return None
+        return {
+            'threshold': 0.0,
+            'total': 0.0
+        }
     else:
         serializer = NestedPriceEstimateSerializer(instance=estimate, context=serializer.context)
         return serializer.data
Expose default threshold and total for price estimate (NC-<I>)