Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Read/FailureMechanismEntityReadExtensions.cs
===================================================================
diff -u -rff1e24434b4e7b8f884aa6accee6cbfeb0dd0cbd -ra2feb7d4a6ba26e07d46e8791dee34879c9d2e63
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Read/FailureMechanismEntityReadExtensions.cs	(.../FailureMechanismEntityReadExtensions.cs)	(revision ff1e24434b4e7b8f884aa6accee6cbfeb0dd0cbd)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Read/FailureMechanismEntityReadExtensions.cs	(.../FailureMechanismEntityReadExtensions.cs)	(revision a2feb7d4a6ba26e07d46e8791dee34879c9d2e63)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using Application.Ringtoets.Storage.DbContext;
 using Application.Ringtoets.Storage.Read.ClosingStructures;
@@ -82,10 +83,11 @@
                                                          IFailureMechanism failureMechanism,
                                                          ReadConversionCollector collector)
         {
-            foreach (FailureMechanismSectionEntity failureMechanismSectionEntity in entity.FailureMechanismSectionEntities)
-            {
-                failureMechanism.AddSection(failureMechanismSectionEntity.Read(collector));
-            }
+            FailureMechanismSection[] readFailureMechanismSections = entity.FailureMechanismSectionEntities
+                                                                               .Select(failureMechanismSectionEntity =>
+                                                                                           failureMechanismSectionEntity.Read(collector))
+                                                                               .ToArray();
+            failureMechanism.AddSections(readFailureMechanismSections);
         }
 
         private static void ReadForeshoreProfiles(this FailureMechanismEntity entity,
Index: Demo/Ringtoets/src/Demo.Ringtoets/Commands/AddNewDemoAssessmentSectionCommand.cs
===================================================================
diff -u -r4a35dfcba3abf411171c9d6ee9e822c0f1956b78 -ra2feb7d4a6ba26e07d46e8791dee34879c9d2e63
--- Demo/Ringtoets/src/Demo.Ringtoets/Commands/AddNewDemoAssessmentSectionCommand.cs	(.../AddNewDemoAssessmentSectionCommand.cs)	(revision 4a35dfcba3abf411171c9d6ee9e822c0f1956b78)
+++ Demo/Ringtoets/src/Demo.Ringtoets/Commands/AddNewDemoAssessmentSectionCommand.cs	(.../AddNewDemoAssessmentSectionCommand.cs)	(revision a2feb7d4a6ba26e07d46e8791dee34879c9d2e63)
@@ -136,6 +136,7 @@
                 IFailureMechanism[] failureMechanisms = demoAssessmentSection.GetFailureMechanisms().ToArray();
                 for (var i = 0; i < failureMechanisms.Length; i++)
                 {
+                    
                     if (i == 0)
                     {
                         var importer = new FailureMechanismSectionsImporter(failureMechanisms[i],
@@ -147,11 +148,8 @@
                     else
                     {
                         // Copy same FailureMechanismSection instances to other failure mechanisms
-                        foreach (FailureMechanismSection section in failureMechanisms[0].Sections)
-                        {
-                            FailureMechanismSection clonedSection = DeepCloneSection(section);
-                            failureMechanisms[i].AddSection(clonedSection);
-                        }
+                        FailureMechanismSection[] clonedSections = failureMechanisms[0].Sections.Select(DeepCloneSection).ToArray();
+                        failureMechanisms[i].AddSections(clonedSections);
                     }
                 }
             }