Index: Ringtoets/Revetment/src/Ringtoets.Revetment.Data/WaveConditionsInput.cs
===================================================================
diff -u -r13e66da0fff74d0062fe1c0872691a6634a4853b -r88e625c7d47b0efd2a5ea8ea118e524c8f8e36ca
--- Ringtoets/Revetment/src/Ringtoets.Revetment.Data/WaveConditionsInput.cs	(.../WaveConditionsInput.cs)	(revision 13e66da0fff74d0062fe1c0872691a6634a4853b)
+++ Ringtoets/Revetment/src/Ringtoets.Revetment.Data/WaveConditionsInput.cs	(.../WaveConditionsInput.cs)	(revision 88e625c7d47b0efd2a5ea8ea118e524c8f8e36ca)
@@ -110,7 +110,7 @@
             set
             {
                 RoundedDouble newOrientation = value.ToPrecision(orientation.NumberOfDecimalPlaces);
-                if (newOrientation < 0 || newOrientation > 360)
+                if (double.IsNaN(newOrientation) || newOrientation < 0 || newOrientation > 360)
                 {
                     throw new ArgumentOutOfRangeException("value", RingtoetsCommonDataResources.Orientation_Value_needs_to_be_between_0_and_360);
                 }