Index: DamEngine/trunk/src/Deltares.DamEngine.IntegrationTests/IntegrationTests/OperationalStabilityProfile1DTests.cs
===================================================================
diff -u -r5990 -r5998
--- DamEngine/trunk/src/Deltares.DamEngine.IntegrationTests/IntegrationTests/OperationalStabilityProfile1DTests.cs	(.../OperationalStabilityProfile1DTests.cs)	(revision 5990)
+++ DamEngine/trunk/src/Deltares.DamEngine.IntegrationTests/IntegrationTests/OperationalStabilityProfile1DTests.cs	(.../OperationalStabilityProfile1DTests.cs)	(revision 5998)
@@ -282,7 +282,7 @@
         List<MacroStability.Io.XmlInput.Point2DType> pl3 = waternet.HeadLines.Any() ? waternet.HeadLines[0]?.WaternetLine.Points.ToList(): null;
         arePointsInLine = arePointsInLine && ArePointsInLine(pl3Points, pl3, "PL-3", messages);
         // PL-4
-        List<MacroStability.Io.XmlInput.Point2DType> pl4 = (waternet.HeadLines.Count() > 1) ? waternet.HeadLines[1]?.WaternetLine.Points.ToList(): null;
+        List<MacroStability.Io.XmlInput.Point2DType> pl4 = (waternet.HeadLines?.Length > 1) ? waternet.HeadLines[1]?.WaternetLine.Points.ToList(): null;
         arePointsInLine = arePointsInLine && ArePointsInLine(pl4Points, pl4, "PL-4", messages);
         string assertMessage = string.Join(Environment.NewLine, messages);
         Assert.That(arePointsInLine, Is.True, assertMessage);