Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PresentationObjects/GrassCoverErosionInwardsScenariosContext.cs
===================================================================
diff -u -r766487194eab00bc9205f5cd29f269c9af5f2ab8 -r491373a8a03238c540e7f0c404bb9919d056cc33
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PresentationObjects/GrassCoverErosionInwardsScenariosContext.cs	(.../GrassCoverErosionInwardsScenariosContext.cs)	(revision 766487194eab00bc9205f5cd29f269c9af5f2ab8)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PresentationObjects/GrassCoverErosionInwardsScenariosContext.cs	(.../GrassCoverErosionInwardsScenariosContext.cs)	(revision 491373a8a03238c540e7f0c404bb9919d056cc33)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using Core.Common.Controls.PresentationObjects;
 using Ringtoets.Common.Data.Calculation;
 using Ringtoets.GrassCoverErosionInwards.Data;
@@ -40,9 +41,17 @@
                                                         GrassCoverErosionInwardsFailureMechanism failureMechanism)
             : base(wrappedData)
         {
+            if (failureMechanism == null)
+            {
+                throw new ArgumentNullException("failureMechanism");
+            }
+
             ParentFailureMechanism = failureMechanism;
         }
 
+        /// <summary>
+        /// The parent failure mechanism of the calculation group.
+        /// </summary>
         public GrassCoverErosionInwardsFailureMechanism ParentFailureMechanism { get; private set; }
     }
 }
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/PresentationObjects/GrassCoverErosionInwardsScenariosContextTest.cs
===================================================================
diff -u -r0efb28b7f5a708daa1cf9e8aeba6b8f84a3ebaf5 -r491373a8a03238c540e7f0c404bb9919d056cc33
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/PresentationObjects/GrassCoverErosionInwardsScenariosContextTest.cs	(.../GrassCoverErosionInwardsScenariosContextTest.cs)	(revision 0efb28b7f5a708daa1cf9e8aeba6b8f84a3ebaf5)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/PresentationObjects/GrassCoverErosionInwardsScenariosContextTest.cs	(.../GrassCoverErosionInwardsScenariosContextTest.cs)	(revision 491373a8a03238c540e7f0c404bb9919d056cc33)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using Core.Common.Controls.PresentationObjects;
 using NUnit.Framework;
 using Ringtoets.Common.Data.Calculation;
@@ -45,5 +46,19 @@
             Assert.AreSame(calculationGroup, context.WrappedData);
             Assert.AreSame(failureMechanism, context.ParentFailureMechanism);
         }
+
+        [Test]
+        public void Constructor_FailureMechanismNull_ThrowArgumentNullException()
+        {
+            // Setup
+            var calculationGroup = new CalculationGroup();
+
+            // Call
+            TestDelegate test = () => new GrassCoverErosionInwardsScenariosContext(calculationGroup, null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(test);
+            Assert.AreEqual("failureMechanism", exception.ParamName);
+        }
     }
 }
\ No newline at end of file