Index: Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/IllustrationPointProperties.cs
===================================================================
diff -u -r390c486bb4cd693ae2f2eaf82a30efcb51480048 -r244dd8357f6de439ff2364fa675a9e128da84b5c
--- Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/IllustrationPointProperties.cs	(.../IllustrationPointProperties.cs)	(revision 390c486bb4cd693ae2f2eaf82a30efcb51480048)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/IllustrationPointProperties.cs	(.../IllustrationPointProperties.cs)	(revision 244dd8357f6de439ff2364fa675a9e128da84b5c)
@@ -138,7 +138,8 @@
                     }
 
                     // If type is not supported, throw exception (currently not possible, safeguard for future)
-                    throw new NotSupportedException($"IllustrationPointNode of type {nameof(FaultTreeIllustrationPoint)} is not supported. Supported types: {nameof(FaultTreeIllustrationPoint)} and {nameof(SubMechanismIllustrationPoint)}");
+                    throw new NotSupportedException($"IllustrationPointNode of type {illustrationPointNode.Data.GetType().Name} is not supported. " +
+                                                    $"Supported types: {nameof(FaultTreeIllustrationPoint)} and {nameof(SubMechanismIllustrationPoint)}");
                 }
                 return points.ToArray();
             }