Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/Soil.cs
===================================================================
diff -u -r4574 -r4605
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/Soil.cs	(.../Soil.cs)	(revision 4574)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/Soil.cs	(.../Soil.cs)	(revision 4605)
@@ -90,7 +90,7 @@
         UsePop = aSoil.UsePop;
         StrengthIncreaseExponent = aSoil.StrengthIncreaseExponent;
         SigmaTauCurve = new SigmaTauCurve();
-        if (aSoil.SigmaTauCurve != null)
+        if ((ShearStrengthModel == Geotechnics.ShearStrengthModel.SigmaTauCurve) && (aSoil.SigmaTauCurve != null))
         {
             SigmaTauCurve.Assign(aSoil.SigmaTauCurve);
         }