Index: Ringtoets/Integration/src/Ringtoets.Integration.Service/RingtoetsDataSynchronizationService.cs
===================================================================
diff -u -r97a0522a94ad88d0087d737fcda84c2f3fe0ee7c -rf69692d8dfdbfc37399ea386ab34cab073de4451
--- Ringtoets/Integration/src/Ringtoets.Integration.Service/RingtoetsDataSynchronizationService.cs	(.../RingtoetsDataSynchronizationService.cs)	(revision 97a0522a94ad88d0087d737fcda84c2f3fe0ee7c)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Service/RingtoetsDataSynchronizationService.cs	(.../RingtoetsDataSynchronizationService.cs)	(revision f69692d8dfdbfc37399ea386ab34cab073de4451)
@@ -284,15 +284,21 @@
                     IEnumerable<IObservable> affectedHydraulicBoundaryLocations =
                         RingtoetsCommonDataSynchronizationService.ClearHydraulicBoundaryLocationOutput(grassCoverErosionOutwardsFailureMechanism.HydraulicBoundaryLocations);
 
-                    changedObservables.AddRange(affectedHydraulicBoundaryLocations);
+                    if (affectedHydraulicBoundaryLocations.Any())
+                    {
+                        changedObservables.AddRange(affectedHydraulicBoundaryLocations);
+                    }
                 }
 
                 if (duneErosionFailureMechanism != null)
                 {
                     IEnumerable<IObservable> affectedDuneLocations =
                         DuneErosionDataSynchronizationService.ClearDuneLocationOutput(duneErosionFailureMechanism.DuneLocations);
 
-                    changedObservables.AddRange(affectedDuneLocations);
+                    if (affectedDuneLocations.Any())
+                    {
+                        changedObservables.AddRange(affectedDuneLocations);
+                    }
                 }
             }