Index: Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/ObservableTestAssessmentSectionStub.cs
===================================================================
diff -u -rdcc94dbcc481ef9f6f83308b82096f85f9cb6f01 -r996ea8ecfc989eaf7453d15668bb3a0fe7129026
--- Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/ObservableTestAssessmentSectionStub.cs	(.../ObservableTestAssessmentSectionStub.cs)	(revision dcc94dbcc481ef9f6f83308b82096f85f9cb6f01)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/ObservableTestAssessmentSectionStub.cs	(.../ObservableTestAssessmentSectionStub.cs)	(revision 996ea8ecfc989eaf7453d15668bb3a0fe7129026)
@@ -46,6 +46,8 @@
             {
                 Name = "Background data"
             };
+
+            HydraulicBoundaryDatabase = new HydraulicBoundaryDatabase();
         }
 
         public string Id { get; }