Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Service/MacroStabilityInwardsInputValidator.cs
===================================================================
diff -u -rfceb242ffb49cc517e2e75dac598c1c6e6019b70 -r648a5d38cd1d22ff37bcbe73380f7c1204644e76
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Service/MacroStabilityInwardsInputValidator.cs	(.../MacroStabilityInwardsInputValidator.cs)	(revision fceb242ffb49cc517e2e75dac598c1c6e6019b70)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Service/MacroStabilityInwardsInputValidator.cs	(.../MacroStabilityInwardsInputValidator.cs)	(revision 648a5d38cd1d22ff37bcbe73380f7c1204644e76)
@@ -91,6 +91,11 @@
 
         private static IEnumerable<string> ValidateZoneBoundaries(MacroStabilityInwardsInput inputParameters)
         {
+            if (!inputParameters.CreateZones || inputParameters.ZoningBoundariesDeterminationType == MacroStabilityInwardsZoningBoundariesDeterminationType.Manual)
+            {
+                yield break;
+            }
+
             RoundedDouble zoneBoundaryLeft = inputParameters.ZoneBoundaryLeft;
             RoundedDouble zoneBoundaryRight = inputParameters.ZoneBoundaryRight;