Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/SoilProfile2DHelper.cs
===================================================================
diff -u -r6123 -r6126
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/SoilProfile2DHelper.cs	(.../SoilProfile2DHelper.cs)	(revision 6123)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/SoilProfile2DHelper.cs	(.../SoilProfile2DHelper.cs)	(revision 6126)
@@ -126,7 +126,11 @@
         var innerSurfaces = new List<GeometrySurface>();
         foreach (GeometrySurface geometrySurface in soilProfileWithoutInnerLoops.Geometry.Surfaces.Where(surface => surface.InnerLoops.Count > 0))
         {
-            innerSurfaces.AddRange(geometrySurface.InnerLoops.Select(innerLoop => soilProfileWithoutInnerLoops.Geometry.FindSurfaceByItsOuterLoop(innerLoop)));
+            foreach (GeometryLoop innerLoop in geometrySurface.InnerLoops)
+            {
+                GeometrySurface innerSurface = soilProfileWithoutInnerLoops.Geometry.FindSurfaceByItsOuterLoop(innerLoop);
+                innerSurfaces.Add(innerSurface);
+            }
             geometrySurface.InnerLoops.Clear();
         }
 
@@ -139,7 +143,11 @@
         var innerSoiLayers2D = new List<SoilLayer2D>();
         foreach (SoilLayer2D surface in soilProfileWithoutInnerLoops.Surfaces.Where(surface => surface.GeometrySurface.InnerLoops.Count > 0))
         {
-            innerSoiLayers2D.AddRange(surface.GeometrySurface.InnerLoops.Select(innerLoop => soilProfileWithoutInnerLoops.FindSoilLayer2DByItsOuterLoop(innerLoop)));
+            foreach (GeometryLoop innerLoop in surface.GeometrySurface.InnerLoops)
+            {
+                SoilLayer2D innerSoilLayer = soilProfileWithoutInnerLoops.FindSoilLayer2DByItsOuterLoop(innerLoop);
+                innerSoiLayers2D.Add(innerSoilLayer);
+            }
             surface.GeometrySurface.InnerLoops.Clear();
         }