Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/FileImporters/FailureMechanismSectionsImporter.cs
===================================================================
diff -u -r8f1db6ac4fd537aba5d537744eb55e557d977cac -r97fb97c5677e2afbd1675ba0fb3e989028a65d09
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/FileImporters/FailureMechanismSectionsImporter.cs	(.../FailureMechanismSectionsImporter.cs)	(revision 8f1db6ac4fd537aba5d537744eb55e557d977cac)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/FileImporters/FailureMechanismSectionsImporter.cs	(.../FailureMechanismSectionsImporter.cs)	(revision 97fb97c5677e2afbd1675ba0fb3e989028a65d09)
@@ -31,6 +31,7 @@
         /// The snapping tolerance in meters.
         /// </summary>
         private const double snappingTolerance = 1;
+
         /// <summary>
         /// The length tolerance between the reference line and the imported FailureMechanismSections in meters.
         /// </summary>
@@ -80,6 +81,11 @@
 
         public override ProgressChangedDelegate ProgressChanged { protected get; set; }
 
+        public override bool CanImportOn(object targetItem)
+        {
+            return base.CanImportOn(targetItem) && ReferenceLineAvailable(targetItem);
+        }
+
         public override bool Import(object targetItem, string filePath)
         {
             var context = (FailureMechanismSectionsContext)targetItem;
@@ -126,6 +132,11 @@
             return true;
         }
 
+        private static bool ReferenceLineAvailable(object targetItem)
+        {
+            return ((FailureMechanismSectionsContext)targetItem).ParentAssessmentSection.ReferenceLine != null;
+        }
+
         private void HandleUserCancellingImport()
         {
             log.Info(Resources.FailureMechanismSectionsImporter_Import_cancelled_no_data_read);
@@ -209,7 +220,7 @@
             ReferenceLine referenceLine = context.ParentAssessmentSection.ReferenceLine;
 
             IEnumerable<Point2D> allStartAndEndPoints = failureMechanismSections.Select(s => s.GetStart()).Concat(failureMechanismSections.Select(s => s.GetLast()));
-            if (allStartAndEndPoints.Any(point => GetDistanceToReferenceLine(point, referenceLine) > snappingTolerance)) 
+            if (allStartAndEndPoints.Any(point => GetDistanceToReferenceLine(point, referenceLine) > snappingTolerance))
             {
                 return false;
             }