Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Update/GrassCoverSlipOffOutwardsFailureMechanismSectionResultUpdateExtensionsTest.cs
===================================================================
diff -u -r0e4717786f2f1a865e48da9fde2089a789bfe02c -r3ef137de1d07bfecd17f0b415d895995d8b2d7b7
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Update/GrassCoverSlipOffOutwardsFailureMechanismSectionResultUpdateExtensionsTest.cs	(.../GrassCoverSlipOffOutwardsFailureMechanismSectionResultUpdateExtensionsTest.cs)	(revision 0e4717786f2f1a865e48da9fde2089a789bfe02c)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Update/GrassCoverSlipOffOutwardsFailureMechanismSectionResultUpdateExtensionsTest.cs	(.../GrassCoverSlipOffOutwardsFailureMechanismSectionResultUpdateExtensionsTest.cs)	(revision 3ef137de1d07bfecd17f0b415d895995d8b2d7b7)
@@ -158,6 +158,38 @@
             Assert.AreEqual(sectionResult.AssessmentLayerThree.Value.ToNullableDecimal(), sectionResultEntity.LayerThree);
 
             mocks.VerifyAll();
-        } 
+        }
+
+        [Test]
+        public void Create_WithNaNResult_ReturnsEntityWithNullResult()
+        {
+            // Setup
+            MockRepository mocks = new MockRepository();
+            var ringtoetsEntities = RingtoetsEntitiesHelper.CreateStub(mocks);
+
+            mocks.ReplayAll();
+
+            var sectionResult = new GrassCoverSlipOffOutwardsFailureMechanismSectionResult(new TestFailureMechanismSection())
+            {
+                StorageId = 1,
+                AssessmentLayerOne = true,
+                AssessmentLayerThree = (RoundedDouble)double.NaN
+            };
+
+            var sectionResultEntity = new GrassCoverSlipOffOutwardsSectionResultEntity
+            {
+                GrassCoverSlipOffOutwardsSectionResultEntityId = sectionResult.StorageId,
+                LayerOne = Convert.ToByte(false),
+                LayerThree = 1.1m,
+            };
+
+            ringtoetsEntities.GrassCoverSlipOffOutwardsSectionResultEntities.Add(sectionResultEntity);
+
+            // Call
+            sectionResult.Update(new PersistenceRegistry(), ringtoetsEntities);
+
+            // Assert
+            Assert.IsNull(sectionResultEntity.LayerThree);
+        }
     }
 }
\ No newline at end of file