Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.KernelWrapper/Kernels/UpliftVan/UpliftVanKernelWrapper.cs
===================================================================
diff -u -r72b12726b73e7e011bed836163635b64220c23f1 -rb351ccdb9efb3be5a6c899c77598eadd4ff76563
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.KernelWrapper/Kernels/UpliftVan/UpliftVanKernelWrapper.cs	(.../UpliftVanKernelWrapper.cs)	(revision 72b12726b73e7e011bed836163635b64220c23f1)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.KernelWrapper/Kernels/UpliftVan/UpliftVanKernelWrapper.cs	(.../UpliftVanKernelWrapper.cs)	(revision b351ccdb9efb3be5a6c899c77598eadd4ff76563)
@@ -21,6 +21,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Deltares.WTIStability;
 using Deltares.WTIStability.Calculation.Wrapper;
 using Deltares.WTIStability.Data.Geo;
@@ -234,7 +235,7 @@
             SlidingCurveResult = (SlidingDualCircle) convertedResult.Curve;
             SlipPlaneResult = convertedResult.SlipPlaneUpliftVan;
 
-            CalculationMessages = convertedResult.Messages;
+            CalculationMessages = convertedResult.Messages ?? Enumerable.Empty<LogMessage>();
         }
     }
 }
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