Index: Ringtoets/Integration/test/Ringtoets.Integration.TestUtil.Test/DataImportHelperTest.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -rcafbeed19a90efec071ebca1c5e372d3804bffdf
--- Ringtoets/Integration/test/Ringtoets.Integration.TestUtil.Test/DataImportHelperTest.cs	(.../DataImportHelperTest.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Integration/test/Ringtoets.Integration.TestUtil.Test/DataImportHelperTest.cs	(.../DataImportHelperTest.cs)	(revision cafbeed19a90efec071ebca1c5e372d3804bffdf)
@@ -62,20 +62,6 @@
         }
 
         [Test]
-        public void ImportFailureMechanismSections_WithoutReferenceLine_ArgumentNullException()
-        {
-            // Setup
-            IFailureMechanism failureMechanism = dikeSection.GetFailureMechanisms().ElementAt(new Random(21).Next(0, 18));
-
-            // Call
-            TestDelegate test = () => DataImportHelper.ImportFailureMechanismSections(dikeSection, failureMechanism);
-
-            // Assert
-            var exception = Assert.Throws<ArgumentNullException>(test);
-            Assert.AreEqual("referenceLine", exception.ParamName);
-        }
-
-        [Test]
         public void ImportFailureMechanismSections_WithReferenceLine_AddsSectionsToSuppliedFailureMechanismOnly()
         {
             // Setup
@@ -94,23 +80,6 @@
         }
 
         [Test]
-        public void ImportFailureMechanismSections_MultipleFailureMechanismsWithoutReferenceLine_ArgumentNullException()
-        {
-            // Setup
-            IFailureMechanism failureMechanism = dikeSection.GetFailureMechanisms().ElementAt(new Random(21).Next(0, 18));
-
-            // Call
-            TestDelegate test = () => DataImportHelper.ImportFailureMechanismSections(dikeSection, new[]
-            {
-                failureMechanism
-            });
-
-            // Assert
-            var exception = Assert.Throws<ArgumentNullException>(test);
-            Assert.AreEqual("referenceLine", exception.ParamName);
-        }
-
-        [Test]
         public void ImportFailureMechanismSections_MultipleFailureMechanismsWithReferenceLine_AddsSectionsToSuppliedFailureMechanismOnly()
         {
             // Setup
@@ -161,17 +130,6 @@
         }
 
         [Test]
-        public void ImportPipingSurfaceLines_WithoutReferenceLine_ArgumentNullException()
-        {
-            // Call
-            TestDelegate test = () => DataImportHelper.ImportPipingSurfaceLines(dikeSection);
-
-            // Assert
-            var exception = Assert.Throws<ArgumentNullException>(test);
-            Assert.AreEqual("referenceLine", exception.ParamName);
-        }
-
-        [Test]
         public void ImportPipingSurfaceLines_WithReferenceLine_AddsFourSurfaceLines()
         {
             // Setup
@@ -221,17 +179,6 @@
         }
 
         [Test]
-        public void ImportMacroStabilityInwardsSurfaceLines_WithoutReferenceLine_ArgumentNullException()
-        {
-            // Call
-            TestDelegate test = () => DataImportHelper.ImportMacroStabilityInwardsSurfaceLines(dikeSection);
-
-            // Assert
-            var exception = Assert.Throws<ArgumentNullException>(test);
-            Assert.AreEqual("referenceLine", exception.ParamName);
-        }
-
-        [Test]
         public void ImportMacroStabilityInwardsSurfaceLines_WithReferenceLine_AddsFourSurfaceLines()
         {
             // Setup
Index: Ringtoets/Storage/src/Ringtoets.Storage.Core/Create/AssessmentSectionCreateExtensions.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -rcafbeed19a90efec071ebca1c5e372d3804bffdf
--- Ringtoets/Storage/src/Ringtoets.Storage.Core/Create/AssessmentSectionCreateExtensions.cs	(.../AssessmentSectionCreateExtensions.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Storage/src/Ringtoets.Storage.Core/Create/AssessmentSectionCreateExtensions.cs	(.../AssessmentSectionCreateExtensions.cs)	(revision cafbeed19a90efec071ebca1c5e372d3804bffdf)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using System.Linq;
 using Core.Common.Util.Extensions;
 using Ringtoets.Common.Data.Contribution;
 using Ringtoets.Common.Data.Hydraulics;
@@ -110,7 +111,7 @@
 
         private static void AddEntityForReferenceLine(AssessmentSection section, AssessmentSectionEntity entity)
         {
-            if (section.ReferenceLine != null)
+            if (section.ReferenceLine.Points.Any())
             {
                 entity.ReferenceLinePointXml = new Point2DCollectionXmlSerializer().ToXml(section.ReferenceLine.Points);
             }
Index: Ringtoets/Storage/test/Ringtoets.Storage.Core.Test/Read/AssessmentSectionEntityReadExtensionsTest.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -rcafbeed19a90efec071ebca1c5e372d3804bffdf
--- Ringtoets/Storage/test/Ringtoets.Storage.Core.Test/Read/AssessmentSectionEntityReadExtensionsTest.cs	(.../AssessmentSectionEntityReadExtensionsTest.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Storage/test/Ringtoets.Storage.Core.Test/Read/AssessmentSectionEntityReadExtensionsTest.cs	(.../AssessmentSectionEntityReadExtensionsTest.cs)	(revision cafbeed19a90efec071ebca1c5e372d3804bffdf)
@@ -100,7 +100,7 @@
             Assert.AreEqual(normativeNorm, section.FailureMechanismContribution.NormativeNorm);
 
             Assert.AreEqual(assessmentSectionComposition, section.Composition);
-            Assert.IsNull(section.ReferenceLine);
+            CollectionAssert.IsEmpty(section.ReferenceLine.Points);
 
             HydraulicBoundaryDatabase hydraulicBoundaryDatabase = section.HydraulicBoundaryDatabase;
             Assert.IsNotNull(hydraulicBoundaryDatabase);