Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingInput.cs
===================================================================
diff -u -r199f41a71b3b4c214f819f4519fffd4dc9418ff9 -ree44c53311cb00d3b95fb5eced329f5ef36e4bf4
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingInput.cs	(.../PipingInput.cs)	(revision 199f41a71b3b4c214f819f4519fffd4dc9418ff9)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingInput.cs	(.../PipingInput.cs)	(revision ee44c53311cb00d3b95fb5eced329f5ef36e4bf4)
@@ -233,6 +233,7 @@
         {
             if (SurfaceLine == null)
             {
+                EntryPointL = RoundedDouble.NaN;
                 ExitPointL = RoundedDouble.NaN;
             }
             else