Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingChartDataFactory.cs
===================================================================
diff -u -r449e2761ad14af6e84ea5c1a56aea71bc535e8f9 -r5dc7eef906ffd48f56d14ea0b0b85441e4f2d529
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingChartDataFactory.cs	(.../PipingChartDataFactory.cs)	(revision 449e2761ad14af6e84ea5c1a56aea71bc535e8f9)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingChartDataFactory.cs	(.../PipingChartDataFactory.cs)	(revision 5dc7eef906ffd48f56d14ea0b0b85441e4f2d529)
@@ -97,13 +97,7 @@
                 throw new ArgumentNullException("surfaceLine");
             }
 
-            return new ChartPointData(new[]
-            {
-                new Point2D(entryPoint, surfaceLine.GetZAtL(entryPoint)),
-            }, Resources.PipingInput_EntryPointL_DisplayName)
-            {
-                Style = new ChartPointStyle(Color.Blue, 8, Color.Gray, 2, ChartPointSymbol.Triangle)
-            };
+            return CreatePointWithZAtL(entryPoint, surfaceLine, Resources.PipingInput_EntryPointL_DisplayName, Color.Blue);
         }
 
         /// <summary>
@@ -126,13 +120,7 @@
                 throw new ArgumentNullException("surfaceLine");
             }
 
-            return new ChartPointData(new[]
-            {
-                new Point2D(exitPoint, surfaceLine.GetZAtL(exitPoint)),
-            }, Resources.PipingInput_ExitPointL_DisplayName)
-            {
-                Style = new ChartPointStyle(Color.Brown, 8, Color.Gray, 2, ChartPointSymbol.Triangle)
-            };
+            return CreatePointWithZAtL(exitPoint, surfaceLine, Resources.PipingInput_ExitPointL_DisplayName, Color.Brown);
         }
 
         /// <summary>
@@ -243,6 +231,30 @@
             return CreateCharacteristicPoint(surfaceLine.DikeToeAtPolder, surfaceLine, PipingDataResources.CharacteristicPoint_DikeToeAtPolder, Color.Silver);
         }
 
+        private static ChartData CreatePointWithZAtL(RoundedDouble pointL, RingtoetsPipingSurfaceLine surfaceLine, string name, Color color)
+        {
+            ChartPointData pointWithZatLData;
+
+            try
+            {
+                var pointZ = surfaceLine.GetZAtL(pointL);
+
+                pointWithZatLData = new ChartPointData(new[]
+                {
+                    new Point2D(pointL, pointZ),
+                }, name)
+                {
+                    Style = new ChartPointStyle(color, 8, Color.Gray, 2, ChartPointSymbol.Triangle)
+                };
+            }
+            catch (ArgumentOutOfRangeException)
+            {
+                pointWithZatLData = CreateEmptyPointData(name);
+            }
+
+            return pointWithZatLData;
+        }
+
         private static ChartData CreateCharacteristicPoint(Point3D worldPoint, RingtoetsPipingSurfaceLine surfaceLine, string name, Color color)
         {
             return CreateLocalPoint(worldPoint, surfaceLine, name, new ChartPointStyle(color, 8, Color.Transparent, 0, ChartPointSymbol.Circle));