Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityCommon/MacroStabilityCommonHelper.cs
===================================================================
diff -u -r5302 -r5304
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityCommon/MacroStabilityCommonHelper.cs	(.../MacroStabilityCommonHelper.cs)	(revision 5302)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityCommon/MacroStabilityCommonHelper.cs	(.../MacroStabilityCommonHelper.cs)	(revision 5304)
@@ -367,10 +367,7 @@
                                             string fileName, Calculator calculator, out List<LogMessage> messages)
     {
         macroStabilityOutput.CalculationResult = CalculationResult.NoRun;
-        if (macroStabilityOutput.StabilityOutputItems == null)
-        {
-            macroStabilityOutput.StabilityOutputItems = new List<MacroStabilityOutputItem>();
-        }
+        macroStabilityOutput.StabilityOutputItems ??= [];
 
         messages = new List<LogMessage>();
         try