Index: Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/AssemblyFactories/GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactory.cs
===================================================================
diff -u -r3f6e53d41b52485159c3c2b34693e30bfb294958 -r9c28314a8df95906c82654e67503f5a794aa741d
--- Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/AssemblyFactories/GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactory.cs	(.../GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactory.cs)	(revision 3f6e53d41b52485159c3c2b34693e30bfb294958)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/AssemblyFactories/GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactory.cs	(.../GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactory.cs)	(revision 9c28314a8df95906c82654e67503f5a794aa741d)
@@ -30,6 +30,7 @@
 using Ringtoets.Common.Data.Exceptions;
 using Ringtoets.Common.Primitives;
 using Ringtoets.Integration.Data.StandAlone.SectionResults;
+using RingtoetsCommonDataResources = Ringtoets.Common.Data.Properties.Resources;
 
 namespace Ringtoets.Integration.Data.StandAlone.AssemblyFactories
 {
@@ -221,21 +222,25 @@
                 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/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/AssemblyFactories/GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactoryTest.cs
===================================================================
diff -u -r1b06b06acb5f70a4adc60c28ee9bcd3e9fd406a3 -r9c28314a8df95906c82654e67503f5a794aa741d
--- Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/AssemblyFactories/GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactoryTest.cs	(.../GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactoryTest.cs)	(revision 1b06b06acb5f70a4adc60c28ee9bcd3e9fd406a3)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/AssemblyFactories/GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactoryTest.cs	(.../GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactoryTest.cs)	(revision 9c28314a8df95906c82654e67503f5a794aa741d)
@@ -624,6 +624,30 @@
             }
         }
 
+        [Test]
+        public void AssembleFailureMechanism_FailureMechanismSectionCalculatorThrowsException_ThrowsAssemblyException()
+        {
+            // Setup
+            var failureMechanism = new GrassCoverSlipOffOutwardsFailureMechanism();
+            failureMechanism.AddSection(FailureMechanismSectionTestFactory.CreateFailureMechanismSection());
+
+            using (new AssemblyToolCalculatorFactoryConfig())
+            {
+                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+                calculator.ThrowExceptionOnCalculate = true;
+
+                // Call
+                TestDelegate call = () => GrassCoverSlipOffOutwardsFailureMechanismAssemblyFactory.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