Index: Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingCalculationActivity.cs
===================================================================
diff -u -r74e3dea657b90b371e265914bee337c76e509d93 -re4613b1908b45105cdc5be7f3fb2f4fad823473e
--- Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingCalculationActivity.cs	(.../PipingCalculationActivity.cs)	(revision 74e3dea657b90b371e265914bee337c76e509d93)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingCalculationActivity.cs	(.../PipingCalculationActivity.cs)	(revision e4613b1908b45105cdc5be7f3fb2f4fad823473e)
@@ -57,7 +57,7 @@
             }
 
             LogMessages.Clear();
-            calculation.Output = null;
+            calculation.ClearOutput();;
 
             PipingCalculationService.Calculate(calculation);
             PipingSemiProbabilisticCalculationService.Calculate(calculation);