diff --git a/functions/classes.py b/functions/classes.py
index d8dae55bcfd525a67aec97c13a73ad72e032251a..a16e27cfa42b36d78f467f8f76d600eb292a55d8 100644
--- a/functions/classes.py
+++ b/functions/classes.py
@@ -266,5 +266,5 @@ class KPIEncoder(json.JSONEncoder):
         if isinstance(o, uuid.UUID):
             return "kpi-" + str(o)
         if isinstance(o, (AggregationLayer)):
-            return "kpi-" + o.properties.label
+            return "kpi-" + o.name
         return super().default(o)
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