Index: Ringtoets/Integration/src/Ringtoets.Integration.IO/Factories/ExportableAssessmentSectionFactory.cs
===================================================================
diff -u -rd5874583519121e94ec4a9ad81381f0c197f06e6 -rf95e168752ab9e77c5521fa68c25cf86e653dbf0
--- Ringtoets/Integration/src/Ringtoets.Integration.IO/Factories/ExportableAssessmentSectionFactory.cs	(.../ExportableAssessmentSectionFactory.cs)	(revision d5874583519121e94ec4a9ad81381f0c197f06e6)
+++ Ringtoets/Integration/src/Ringtoets.Integration.IO/Factories/ExportableAssessmentSectionFactory.cs	(.../ExportableAssessmentSectionFactory.cs)	(revision f95e168752ab9e77c5521fa68c25cf86e653dbf0)
@@ -44,6 +44,7 @@
         /// <returns>An <see cref="ExportableAssessmentSection"/> with assembly results.</returns>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="assessmentSection"/>
         /// is <c>null</c>.</exception>
+        /// <exception cref="ArgumentException">Thrown when no reference line is set for <paramref name="assessmentSection"/>.</exception>
         /// <exception cref="AssemblyException">Thrown when assembly results cannot be created for <paramref name="assessmentSection"/>.</exception>
         public static ExportableAssessmentSection CreateExportableAssessmentSection(AssessmentSection assessmentSection)
         {
@@ -52,6 +53,11 @@
                 throw new ArgumentNullException(nameof(assessmentSection));
             }
 
+            if (assessmentSection.ReferenceLine == null)
+            {
+                throw new ArgumentException("reference line of assessment section cannot be null.");
+            }
+
             return new ExportableAssessmentSection(assessmentSection.Name, 
                                                    assessmentSection.Id,
                                                    assessmentSection.ReferenceLine.Points,
Index: Ringtoets/Integration/test/Ringtoets.Integration.IO.Test/Factories/ExportableAssessmentSectionFactoryTest.cs
===================================================================
diff -u -r39fbcdb4cfd610d8c8dccbe1793d8f17fce156c4 -rf95e168752ab9e77c5521fa68c25cf86e653dbf0
--- Ringtoets/Integration/test/Ringtoets.Integration.IO.Test/Factories/ExportableAssessmentSectionFactoryTest.cs	(.../ExportableAssessmentSectionFactoryTest.cs)	(revision 39fbcdb4cfd610d8c8dccbe1793d8f17fce156c4)
+++ Ringtoets/Integration/test/Ringtoets.Integration.IO.Test/Factories/ExportableAssessmentSectionFactoryTest.cs	(.../ExportableAssessmentSectionFactoryTest.cs)	(revision f95e168752ab9e77c5521fa68c25cf86e653dbf0)
@@ -54,9 +54,27 @@
         }
 
         [Test]
-        public void CreateExportableAssessmentSection_WithAssessmentSection_ReturnsExpectedValues()
+        public void CreateExportableAssessmentSection_WithAssessmentSectionWithoutReferenceLine_ThrowsArgumentException()
         {
             // Setup
+            var random = new Random(21);
+            var assessmentSection = new AssessmentSection(random.NextEnumValue<AssessmentSectionComposition>());
+
+            // Call
+            TestDelegate call = () =>
+            {
+                ExportableAssessmentSectionFactory.CreateExportableAssessmentSection(assessmentSection);
+            };
+
+            // Assert
+            var exception = Assert.Throws<ArgumentException>(call);
+            Assert.AreEqual("reference line of assessment section cannot be null.", exception.Message);
+        }
+
+        [Test]
+        public void CreateExportableAssessmentSection_WithAssessmentSectionWithReferenceLine_ReturnsExpectedValues()
+        {
+            // Setup
             const string name = "assessmentSectionName";
             const string id = "assessmentSectionId";