Index: Riskeer/Piping/src/Riskeer.Piping.Service/Probabilistic/ProbabilisticPipingCalculationService.cs
===================================================================
diff -u -rab041ec7eb5f113ed57f2ff659f5f527de07b1db -rb59bdeedc35d66fb4053a7d7164ac9eb68dcea9d
--- Riskeer/Piping/src/Riskeer.Piping.Service/Probabilistic/ProbabilisticPipingCalculationService.cs	(.../ProbabilisticPipingCalculationService.cs)	(revision ab041ec7eb5f113ed57f2ff659f5f527de07b1db)
+++ Riskeer/Piping/src/Riskeer.Piping.Service/Probabilistic/ProbabilisticPipingCalculationService.cs	(.../ProbabilisticPipingCalculationService.cs)	(revision b59bdeedc35d66fb4053a7d7164ac9eb68dcea9d)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Riskeer.Common.Data.AssessmentSection;
@@ -44,8 +45,24 @@
         /// <param name="generalInput">The <see cref="GeneralPipingInput"/> to derive values from used during the validation.</param>
         /// <param name="assessmentSection">The <see cref="IAssessmentSection"/> for which to validate the values.</param>
         /// <returns><c>true</c> if <paramref name="calculation"/> has no validation errors; <c>false</c> otherwise.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
         public static bool Validate(ProbabilisticPipingCalculation calculation, GeneralPipingInput generalInput, IAssessmentSection assessmentSection)
         {
+            if (calculation == null)
+            {
+                throw new ArgumentNullException(nameof(calculation));
+            }
+
+            if (generalInput == null)
+            {
+                throw new ArgumentNullException(nameof(generalInput));
+            }
+
+            if (assessmentSection == null)
+            {
+                throw new ArgumentNullException(nameof(assessmentSection));
+            }
+
             CalculationServiceHelper.LogValidationBegin();
             
             CalculationServiceHelper.LogMessagesAsWarning(PipingCalculationValidationHelper.GetValidationWarnings(calculation.InputParameters).ToArray());
Index: Riskeer/Piping/test/Riskeer.Piping.Service.Test/Probabilistic/ProbabilisticPipingCalculationServiceTest.cs
===================================================================
diff -u -rab041ec7eb5f113ed57f2ff659f5f527de07b1db -rb59bdeedc35d66fb4053a7d7164ac9eb68dcea9d
--- Riskeer/Piping/test/Riskeer.Piping.Service.Test/Probabilistic/ProbabilisticPipingCalculationServiceTest.cs	(.../ProbabilisticPipingCalculationServiceTest.cs)	(revision ab041ec7eb5f113ed57f2ff659f5f527de07b1db)
+++ Riskeer/Piping/test/Riskeer.Piping.Service.Test/Probabilistic/ProbabilisticPipingCalculationServiceTest.cs	(.../ProbabilisticPipingCalculationServiceTest.cs)	(revision b59bdeedc35d66fb4053a7d7164ac9eb68dcea9d)
@@ -57,6 +57,51 @@
             calculation = SemiProbabilisticPipingCalculationScenarioTestFactory.CreateProbabilisticPipingCalculationScenarioWithValidInput(new TestHydraulicBoundaryLocation());
             testSurfaceLineTopLevel = calculation.InputParameters.SurfaceLine.Points.Max(p => p.Z);
         }
+
+        [Test]
+        public void Validate_CalculationNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            mocks.ReplayAll();
+            
+            // Call
+            void Call() => ProbabilisticPipingCalculationService.Validate(null, new GeneralPipingInput(), assessmentSection);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(Call);
+            Assert.AreEqual("calculation", exception.ParamName);
+            mocks.VerifyAll();
+        }
+
+        [Test]
+        public void Validate_GeneralInputNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            mocks.ReplayAll();
+            
+            // Call
+            void Call() => ProbabilisticPipingCalculationService.Validate(new TestProbabilisticPipingCalculation(), null, assessmentSection);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(Call);
+            Assert.AreEqual("generalInput", exception.ParamName);
+            mocks.VerifyAll();
+        }
+
+        [Test]
+        public void Validate_AssessmentSectionNull_ThrowsArgumentNullException()
+        {
+            // Call
+            void Call() => ProbabilisticPipingCalculationService.Validate(new TestProbabilisticPipingCalculation(), new GeneralPipingInput(), null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(Call);
+            Assert.AreEqual("assessmentSection", exception.ParamName);
+        }
         
         [Test]
         public void Validate_Always_LogStartAndEndOfValidatingInputs()