Index: Ringtoets/Common/src/Ringtoets.Common.Forms/Views/IllustrationPointsChartControl.cs
===================================================================
diff -u -r3748f21da69e2c5a0f5d59168ed1d00807bedf00 -r44c53e8ad9342f1b23ce2524c9fa69b92045bf53
--- Ringtoets/Common/src/Ringtoets.Common.Forms/Views/IllustrationPointsChartControl.cs	(.../IllustrationPointsChartControl.cs)	(revision 3748f21da69e2c5a0f5d59168ed1d00807bedf00)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/Views/IllustrationPointsChartControl.cs	(.../IllustrationPointsChartControl.cs)	(revision 44c53e8ad9342f1b23ce2524c9fa69b92045bf53)
@@ -36,7 +36,7 @@
     {
         private GeneralResult data;
 
-        private StackChartData chartData;
+        private readonly StackChartData chartData;
 
         /// <summary>
         /// Creates a new instance of <see cref="IllustrationPointsChartControl"/>.
@@ -65,6 +65,11 @@
                 {
                     SetChartData();
                 }
+                else
+                {
+                    chartData.Clear();
+                    chartData.NotifyObservers();
+                }
             }
         }