Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs
===================================================================
diff -u -r1046827a1c245c8eef5d4438fbb5dec43cb6c109 -rfa493fef4f3f244664392c28896afb2052596898
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs	(.../GrassCoverErosionInwardsGuiPlugin.cs)	(revision 1046827a1c245c8eef5d4438fbb5dec43cb6c109)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs	(.../GrassCoverErosionInwardsGuiPlugin.cs)	(revision fa493fef4f3f244664392c28896afb2052596898)
@@ -367,7 +367,7 @@
                     CreateHydraRingTargetProbabilityCalculationActivity(
                         context.FailureMechanism.Sections.First(), // TODO: Pass dike section based on cross section of calculation with reference line
                         Path.GetDirectoryName(context.AssessmentSection.HydraulicBoundaryDatabase.FilePath),
-                        calc)));
+                        calc)).ToList());
         }
 
         #endregion