Index: dam classic/trunk/src/Stability/StabilityModel.cs
===================================================================
diff -u -r190 -r230
--- dam classic/trunk/src/Stability/StabilityModel.cs	(.../StabilityModel.cs)	(revision 190)
+++ dam classic/trunk/src/Stability/StabilityModel.cs	(.../StabilityModel.cs)	(revision 230)
@@ -2,7 +2,6 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.ComponentModel;
-using System.Diagnostics.Contracts;
 using System.Linq;
 using System.Xml.Serialization;
 using Deltares.Geometry;
@@ -4645,11 +4644,6 @@
                 {
                     return;
                 }
-
-                Contract.Assume(SlipCircle != null);
-                Contract.Assume(rtoCalculationgrid.SurfaceLine.Geometry.Count > 0);
-                Contract.Assume(rtoCalculationgrid.SurfaceLine.CharacteristicPoints.Count > 0);
-
                 rtoCalculationgrid.CreateGrid(this);
             }
 
@@ -4814,11 +4808,7 @@
                     {
                         return;
                     }
-
-                    Contract.Assume(SlipCircle != null);
-                    Contract.Assume(rtoCalculationgrid.SurfaceLine.Geometry.Count > 0);
-                    Contract.Assume(rtoCalculationgrid.SurfaceLine.CharacteristicPoints.Count > 0);
-
+                    
                     if (CalculationModel == CalculationModel.RTO || CalculationModel == CalculationModel.WBI)
                     {
                         Delayed.Invoke(UpdateAutomaticDefinitions);