Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators.Tests/KernelWrappers/Common/PlLinesHelperTests.cs
===================================================================
diff -u -r6851 -r6936
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators.Tests/KernelWrappers/Common/PlLinesHelperTests.cs	(.../PlLinesHelperTests.cs)	(revision 6851)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators.Tests/KernelWrappers/Common/PlLinesHelperTests.cs	(.../PlLinesHelperTests.cs)	(revision 6936)
@@ -50,9 +50,10 @@
 
         var riverLevel = 1.0;
         var timeStepDateTime = new DateTime();
-        PlLines plLines = PlLinesHelper.CreatePlLinesForPiping(timeStepDateTime, location, soilProfile1D, riverLevel, out _);
+        PlLines plLines = PlLinesHelper.CreatePlLinesForPiping(timeStepDateTime, location, soilProfile1D, riverLevel, out string warningMessage);
         Assert.Multiple(() =>
         {
+            Assert.That(warningMessage, Is.Null);
             Assert.That(plLines.PlLineCount, Is.EqualTo(4));
             Assert.That(plLines.Lines[PlLineType.Pl1].Points, Has.Count.EqualTo(8));
             Assert.That(new PlLinePoint(0.000, 1.000).LocationEquals(plLines.Lines[PlLineType.Pl1].Points[0]), Is.True);
@@ -90,9 +91,10 @@
 
         var riverLevel = 1.0;
         var timeStepDateTime = new DateTime();
-        PlLines plLines = PlLinesHelper.CreatePlLinesForPiping(timeStepDateTime, location, soilProfile1D, riverLevel, out _);
+        PlLines plLines = PlLinesHelper.CreatePlLinesForPiping(timeStepDateTime, location, soilProfile1D, riverLevel, out string warningMessage);
         Assert.Multiple(() =>
         {
+            Assert.That(warningMessage, Is.Null);
             Assert.That(plLines.PlLineCount, Is.EqualTo(4));
             Assert.That(plLines.Lines[PlLineType.Pl1].Points, Has.Count.EqualTo(8));
             Assert.That(new PlLinePoint(0.000, 1.000).LocationEquals(plLines.Lines[PlLineType.Pl1].Points[0]), Is.True);
@@ -141,9 +143,10 @@
         var riverLevel = 0.5;
 
         var timeStepDateTime = new DateTime();
-        PlLines plLines = PlLinesHelper.CreatePlLinesForPiping(timeStepDateTime, location, soilProfile1D, riverLevel, out _);
+        PlLines plLines = PlLinesHelper.CreatePlLinesForPiping(timeStepDateTime, location, soilProfile1D, riverLevel, out string warningMessage);
         Assert.Multiple(() =>
         {
+            Assert.That(warningMessage, Is.Null);
             Assert.That(plLines.PlLineCount, Is.EqualTo(4));
             Assert.That(plLines.Lines[PlLineType.Pl1].Points, Has.Count.EqualTo(8));
             Assert.That(new PlLinePoint(0.000, 0.500).LocationEquals(plLines.Lines[PlLineType.Pl1].Points[0]), Is.True);
Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/WtiPipingBligh/WtiPipingBlighKernelWrapper.cs
===================================================================
diff -u -r6895 -r6936
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/WtiPipingBligh/WtiPipingBlighKernelWrapper.cs	(.../WtiPipingBlighKernelWrapper.cs)	(revision 6895)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/WtiPipingBligh/WtiPipingBlighKernelWrapper.cs	(.../WtiPipingBlighKernelWrapper.cs)	(revision 6936)
@@ -69,8 +69,7 @@
             FoSp = defaultMaxReturnValue
         };
         kernelDataOutput = wtiPipingBlighOutput;
-        if (damKernelInput.SubSoilScenario.SegmentFailureMechanismType != null &&
-            damKernelInput.SubSoilScenario.SegmentFailureMechanismType.Value.In(SegmentFailureMechanismType.Piping, SegmentFailureMechanismType.All))
+        if (damKernelInput.SubSoilScenario.SegmentFailureMechanismType!.Value.In(SegmentFailureMechanismType.Piping, SegmentFailureMechanismType.All))
         {
             try
             {