Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.TestUtil/MacroStabilityInwardsViewChartDataAssert.cs
===================================================================
diff -u -r7585d2fd78627d94d55ffa16423af90a91e4efd4 -r96764c996a0c059b15ccfd968ba165a0ede1b1e3
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.TestUtil/MacroStabilityInwardsViewChartDataAssert.cs	(.../MacroStabilityInwardsViewChartDataAssert.cs)	(revision 7585d2fd78627d94d55ffa16423af90a91e4efd4)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.TestUtil/MacroStabilityInwardsViewChartDataAssert.cs	(.../MacroStabilityInwardsViewChartDataAssert.cs)	(revision 96764c996a0c059b15ccfd968ba165a0ede1b1e3)
@@ -67,7 +67,9 @@
             Assert.IsInstanceOf<ChartDataCollection>(actual);
             var soilProfileChartData = (ChartDataCollection) actual;
 
-            IMacroStabilityInwardsSoilLayer2D[] layers = soilProfileUnderSurface?.GetLayersRecursively().ToArray() ?? new IMacroStabilityInwardsSoilLayer2D[0];
+            IMacroStabilityInwardsSoilLayer2D[] layers = soilProfileUnderSurface?.Layers != null
+                                                             ? MacroStabilityInwardsSoilProfile2DLayersHelper.GetLayersRecursively(soilProfileUnderSurface.Layers).ToArray()
+                                                             : new IMacroStabilityInwardsSoilLayer2D[0];
             int expectedLayerCount = layers.Length;
 
             Assert.AreEqual(expectedLayerCount, soilProfileChartData.Collection.Count());