Index: dam engine/trunk/src/Deltares.DamEngine.Interface/FillDamFromXmlInput.cs
===================================================================
diff -u -r601 -r612
--- dam engine/trunk/src/Deltares.DamEngine.Interface/FillDamFromXmlInput.cs	(.../FillDamFromXmlInput.cs)	(revision 601)
+++ dam engine/trunk/src/Deltares.DamEngine.Interface/FillDamFromXmlInput.cs	(.../FillDamFromXmlInput.cs)	(revision 612)
@@ -93,6 +93,10 @@
             {
                 throw new NullReferenceException("No soils defined in the input");
             }
+            if (input.Segments == null)
+            {
+                throw new NullReferenceException("No segments defined in the input");
+            }
         }
 
         /// <summary>
Index: dam engine/trunk/src/Deltares.DamEngine.Interface.Tests/PipingBlighTests.cs
===================================================================
diff -u -r562 -r612
--- dam engine/trunk/src/Deltares.DamEngine.Interface.Tests/PipingBlighTests.cs	(.../PipingBlighTests.cs)	(revision 562)
+++ dam engine/trunk/src/Deltares.DamEngine.Interface.Tests/PipingBlighTests.cs	(.../PipingBlighTests.cs)	(revision 612)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using System.IO;
 using NUnit.Framework;
 
@@ -27,7 +28,7 @@
     [TestFixture]
     public class PipingBlighTests
     {
-        [Test, Ignore("Work in progress")]
+        [Test]
         public void CanPerformBlighDesignPipingVoorbeeld1()
         {
             const string fileName = @"TestFiles\PipingVoorbeeld1_BlighInputFile.xml";
@@ -38,8 +39,8 @@
             Assert.IsNotNull(outputString);
         }
 
-        [Test, Ignore("Work in progress")]
-        public void CanPerformBlighDesignRechterDiezedijk()
+        [Test, ExpectedException(typeof(NullReferenceException))]
+        public void CanNotPerformBlighDesignRechterDiezedijkForMissingSegments()
         {
             const string fileName = @"TestFiles\Rechter Diezedijk_BlighInputFile.xml";
             string inputString = File.ReadAllText(fileName);