diff --git a/api/s15_energy.py b/api/s15_energy.py
index 92eccc6..2845056 100644
--- a/api/s15_energy.py
+++ b/api/s15_energy.py
@@ -230,4 +230,4 @@ def unset_pump_energy_by_curve(name: str, curve: str) -> ChangeSet:
         pattern = str(row2['pattern']) if row2 != None else None
         cs.append(g_update_prefix | {'type': 'pump_energy', 'pump' : pump, 'price': price, 'pattern': pattern, 'effic': None})
 
-    return ChangeSet()
+    return cs