Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.IO/Writers/GrassCoverErosionInwardsCalculationConfigurationWriter.cs
===================================================================
diff -u -r7a466d4ccb9d859b47f565b400808eb6933b18f0 -r71d49118c3ebc21c6c78375c31ed3c8b2e9753ed
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.IO/Writers/GrassCoverErosionInwardsCalculationConfigurationWriter.cs	(.../GrassCoverErosionInwardsCalculationConfigurationWriter.cs)	(revision 7a466d4ccb9d859b47f565b400808eb6933b18f0)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.IO/Writers/GrassCoverErosionInwardsCalculationConfigurationWriter.cs	(.../GrassCoverErosionInwardsCalculationConfigurationWriter.cs)	(revision 71d49118c3ebc21c6c78375c31ed3c8b2e9753ed)
@@ -75,6 +75,11 @@
 
         private static void WriteWaveReduction(GrassCoverErosionInwardsInput input, XmlWriter writer)
         {
+            if (input.DikeProfile == null)
+            {
+                return;
+            }
+
             writer.WriteStartElement(ConfigurationSchemaIdentifiers.WaveReduction);
 
             writer.WriteElementString(