Index: Riskeer/DuneErosion/src/Riskeer.DuneErosion.Service/DuneErosionDataSynchronizationService.cs
===================================================================
diff -u -r6c311caef5e49401eabeb899b36d635775aab1fe -r579d646c8bae668bd48a2dcc0b0e1831031c6c13
--- Riskeer/DuneErosion/src/Riskeer.DuneErosion.Service/DuneErosionDataSynchronizationService.cs	(.../DuneErosionDataSynchronizationService.cs)	(revision 6c311caef5e49401eabeb899b36d635775aab1fe)
+++ Riskeer/DuneErosion/src/Riskeer.DuneErosion.Service/DuneErosionDataSynchronizationService.cs	(.../DuneErosionDataSynchronizationService.cs)	(revision 579d646c8bae668bd48a2dcc0b0e1831031c6c13)
@@ -117,16 +117,27 @@
 
             foreach (DuneLocationCalculationsForTargetProbability calculationsForTargetProbability in failureMechanism.DuneLocationCalculationsForUserDefinedTargetProbabilities)
             {
-                affectedCalculations.AddRange(ClearDuneLocationCalculationsOutput(calculationsForTargetProbability));
+                affectedCalculations.AddRange(ClearDuneLocationCalculationsOutput(calculationsForTargetProbability.DuneLocationCalculations));
             }
 
             return affectedCalculations;
         }
 
-        private static IEnumerable<IObservable> ClearDuneLocationCalculationsOutput(DuneLocationCalculationsForTargetProbability calculationsForTargetProbability)
+        /// <summary>
+        /// Clears the output of the provided dune location calculations.
+        /// </summary>
+        /// <param name="calculations">The calculations for which the output needs to be cleared.</param>
+        /// <returns>All objects changed during the clear.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="calculations"/> is <c>null</c>.</exception>
+        public static IEnumerable<IObservable> ClearDuneLocationCalculationsOutput(IEnumerable<DuneLocationCalculation> calculations)
         {
-            IEnumerable<DuneLocationCalculation> affectedCalculations = calculationsForTargetProbability.DuneLocationCalculations.Where(c => c.Output != null).ToArray();
+            if (calculations == null)
+            {
+                throw new ArgumentNullException(nameof(calculations));
+            }
 
+            IEnumerable<DuneLocationCalculation> affectedCalculations = calculations.Where(c => c.Output != null).ToArray();
+
             affectedCalculations.ForEachElementDo(c => c.Output = null);
 
             return affectedCalculations;