Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Read/MacroStabilityInwards/MacroStabilityInwardsCalculationEntityReadExtensions.cs
===================================================================
diff -u -r06e3624f72482462ebb7e4ee29d1a8173005e59d -r3a8f6ba90c3d906662b38b9420858e48665ce799
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Read/MacroStabilityInwards/MacroStabilityInwardsCalculationEntityReadExtensions.cs	(.../MacroStabilityInwardsCalculationEntityReadExtensions.cs)	(revision 06e3624f72482462ebb7e4ee29d1a8173005e59d)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Read/MacroStabilityInwards/MacroStabilityInwardsCalculationEntityReadExtensions.cs	(.../MacroStabilityInwardsCalculationEntityReadExtensions.cs)	(revision 3a8f6ba90c3d906662b38b9420858e48665ce799)
@@ -129,6 +129,8 @@
             SetGridparametersToInput(inputParameters.LeftGrid, inputParameters.RightGrid, entity);
 
             inputParameters.CreateZones = Convert.ToBoolean(entity.CreateZones);
+            inputParameters.ZoneBoundaryLeft = (RoundedDouble) entity.ZoneBoundaryLeft.ToNullAsNaN();
+            inputParameters.ZoneBoundaryRight = (RoundedDouble) entity.ZoneBoundaryRight.ToNullAsNaN();
         }
 
         private static void SetSurfaceLineToInput(MacroStabilityInwardsInput inputParameters,