Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesOperational/OperationalCalculator.cs
===================================================================
diff -u -r4053 -r4132
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesOperational/OperationalCalculator.cs	(.../OperationalCalculator.cs)	(revision 4053)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesOperational/OperationalCalculator.cs	(.../OperationalCalculator.cs)	(revision 4132)
@@ -188,7 +188,7 @@
     /// </summary>
     /// <param name="dateTime">The date time.</param>
     /// <returns></returns>
-    public static string DateToTimeStamp(DateTime dateTime)
+    public string DateToTimeStamp(DateTime dateTime)
     {
         // Following 2 lines is an example how to handle customization of this format.
         // TNO at the last moment decided they did not need this change so we change it back to 
@@ -291,6 +291,7 @@
                                                out CalculationResult calculationResult,
                                                List<LogMessage> calculationMessages)
     {
+        
         // Perform validation
         var designResults = new List<DesignResult>();
         var locationCalculationMessages = new List<LogMessage>();
@@ -327,7 +328,10 @@
 
             calculationResult = CalculationResult.Succeeded;
             kernelWrapper.PostProcess(damKernelInput, kernelDataOutput, null, resultMessage, out designResults);
-            timeSerieEntry.Value = designResults[0].SafetyFactor.Value;
+            if (designResults.Count > 0)
+            {
+                timeSerieEntry.Value = designResults[0].SafetyFactor.Value;
+            }
         }
         catch (Exception exception)
         {
@@ -485,7 +489,7 @@
     /// </summary>
     /// <param name="sensor">The sensor.</param>
     /// <param name="hasSeriesBySensorID">if set to <c>true</c> [has series by sensor ID].</param>
-    private static void ThrowIfSensorNotExists(Sensor sensor, bool hasSeriesBySensorID)
+    private void ThrowIfSensorNotExists(Sensor sensor, bool hasSeriesBySensorID)
     {
         if (!hasSeriesBySensorID)
         {
@@ -503,7 +507,7 @@
     /// <param name="firstSeriesEntries">The first series entries.</param>
     /// <param name="timeSeries">The time series.</param>
     /// <param name="hasFirstSeriesEntries">if set to <c>true</c> [has first series entries].</param>
-    private static void ThrowIfTimeEntryCountDontMatch(HashSet<DateTime> firstSeriesEntries, TimeSerie timeSeries,
+    private void ThrowIfTimeEntryCountDontMatch(HashSet<DateTime> firstSeriesEntries, TimeSerie timeSeries,
                                                        bool hasFirstSeriesEntries)
     {
         if (hasFirstSeriesEntries)
@@ -534,7 +538,7 @@
         }
     }
 
-    private static void ThrowIfTimeEntriesKeysDontMatch(DateTime key, HashSet<DateTime> firstSeriesEntries)
+    private void ThrowIfTimeEntriesKeysDontMatch(DateTime key, HashSet<DateTime> firstSeriesEntries)
     {
         // TODO log info
         if (!firstSeriesEntries.Contains(key))