Index: src/Deltares.DSoilModel.Forms/DrawingBoring.cs
===================================================================
diff -u -r631 -r856
--- src/Deltares.DSoilModel.Forms/DrawingBoring.cs	(.../DrawingBoring.cs)	(revision 631)
+++ src/Deltares.DSoilModel.Forms/DrawingBoring.cs	(.../DrawingBoring.cs)	(revision 856)
@@ -300,7 +300,7 @@
         {
             for (int i = 0; i < boring.BoringDatarows.Count; i++)
             {
-                if (i < boring.BoringLayers.Count)
+                if (i < boring.BoringLayers.Count && boring.BoringLayers[i].Soil != null)
                 {
                     boring.BoringDatarows[i].SoilColor = boring.BoringLayers[i].Soil.Color;
                 }