Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismAssemblyFactory.cs
===================================================================
diff -u -r65af0c896b50865f6ffe14d230ae0691202aea4e -r8aa0cdda5f051a040e7056fe49e0df00ea29ca9d
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismAssemblyFactory.cs	(.../GrassCoverErosionOutwardsFailureMechanismAssemblyFactory.cs)	(revision 65af0c896b50865f6ffe14d230ae0691202aea4e)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismAssemblyFactory.cs	(.../GrassCoverErosionOutwardsFailureMechanismAssemblyFactory.cs)	(revision 8aa0cdda5f051a040e7056fe49e0df00ea29ca9d)
@@ -29,6 +29,7 @@
 using Ringtoets.Common.Data.AssemblyTool;
 using Ringtoets.Common.Data.Exceptions;
 using Ringtoets.Common.Primitives;
+using RingtoetsCommonDataResources = Ringtoets.Common.Data.Properties.Resources;
 
 namespace Ringtoets.GrassCoverErosionOutwards.Data
 {
@@ -222,21 +223,25 @@
                 return FailureMechanismAssemblyResultFactory.CreateNotApplicableCategory();
             }
 
-            IEnumerable<FailureMechanismSectionAssemblyCategoryGroup> sectionAssemblies =
-                failureMechanism.SectionResults.Select(GetSectionAssemblyCategoryGroup).ToArray();
-
-            IAssemblyToolCalculatorFactory calculatorFactory = AssemblyToolCalculatorFactory.Instance;
-            IFailureMechanismAssemblyCalculator calculator =
-                calculatorFactory.CreateFailureMechanismAssemblyCalculator(AssemblyToolKernelFactory.Instance);
-
             try
             {
+                IEnumerable<FailureMechanismSectionAssemblyCategoryGroup> sectionAssemblies =
+                    failureMechanism.SectionResults.Select(GetSectionAssemblyCategoryGroup).ToArray();
+
+                IAssemblyToolCalculatorFactory calculatorFactory = AssemblyToolCalculatorFactory.Instance;
+                IFailureMechanismAssemblyCalculator calculator =
+                    calculatorFactory.CreateFailureMechanismAssemblyCalculator(AssemblyToolKernelFactory.Instance);
+
                 return calculator.Assemble(sectionAssemblies);
             }
             catch (FailureMechanismAssemblyCalculatorException e)
             {
                 throw new AssemblyException(e.Message, e);
             }
+            catch (AssemblyException e)
+            {
+                throw new AssemblyException(RingtoetsCommonDataResources.FailureMechanismAssemblyFactory_Error_while_assembling_failureMechanism, e);
+            }
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismAssemblyFactoryTest.cs
===================================================================
diff -u -r6d8e05710b2c63e1f1f62ff3fd1b73346618286f -r8aa0cdda5f051a040e7056fe49e0df00ea29ca9d
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismAssemblyFactoryTest.cs	(.../GrassCoverErosionOutwardsFailureMechanismAssemblyFactoryTest.cs)	(revision 6d8e05710b2c63e1f1f62ff3fd1b73346618286f)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismAssemblyFactoryTest.cs	(.../GrassCoverErosionOutwardsFailureMechanismAssemblyFactoryTest.cs)	(revision 8aa0cdda5f051a040e7056fe49e0df00ea29ca9d)
@@ -644,6 +644,30 @@
             }
         }
 
+        [Test]
+        public void AssembleFailureMechanism_FailureMechanismSectionCalculatorThrowsException_ThrowsAssemblyException()
+        {
+            // Setup
+            var failureMechanism = new GrassCoverErosionOutwardsFailureMechanism();
+            failureMechanism.AddSection(FailureMechanismSectionTestFactory.CreateFailureMechanismSection());
+
+            using (new AssemblyToolCalculatorFactoryConfig())
+            {
+                var calculatorfactory = (TestAssemblyToolCalculatorFactory)AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+                calculator.ThrowExceptionOnCalculate = true;
+
+                // Call
+                TestDelegate call = () => GrassCoverErosionOutwardsFailureMechanismAssemblyFactory.AssembleFailureMechanism(failureMechanism);
+
+                // Assert
+                var exception = Assert.Throws<AssemblyException>(call);
+                Exception innerException = exception.InnerException;
+                Assert.IsInstanceOf<AssemblyException>(innerException);
+                Assert.AreEqual("Voor een of meerdere vakken kan geen resultaat worden bepaald.", exception.Message);
+            }
+        }
+
         #endregion
     }
 }
\ No newline at end of file