Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/HydraRingConfiguration.cs
===================================================================
diff -u -r59c7d166234297687e0b709fb5112836f22b32e5 -r78bf55af8849866f8a6d1636508db4a8142ae69d
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/HydraRingConfiguration.cs	(.../HydraRingConfiguration.cs)	(revision 59c7d166234297687e0b709fb5112836f22b32e5)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/HydraRingConfiguration.cs	(.../HydraRingConfiguration.cs)	(revision 78bf55af8849866f8a6d1636508db4a8142ae69d)
@@ -55,6 +55,8 @@
         {
             var configurationDictionary = new Dictionary<string, List<OrderedDictionary>>();
 
+            ValidateInput();
+
             InitializeHydraulicModelsConfiguration(configurationDictionary);
             InitializeSectionsConfiguration(configurationDictionary);
             InitializeDesignTablesConfiguration(configurationDictionary);
@@ -64,17 +66,32 @@
             return GenerateDataBaseCreationScript(configurationDictionary);
         }
 
+        private void ValidateInput()
+        {
+            var formattedExceptionMessage = "Cannot generate database creation script: {0} unspecified.";
+
+            if (HydraRingTimeIntegrationSchemeType == null)
+            {
+                throw new InvalidOperationException(string.Format(formattedExceptionMessage, "HydraRingTimeIntegrationSchemeType"));
+            }
+
+            if (HydraRingUncertaintiesType == null)
+            {
+                throw new InvalidOperationException(string.Format(formattedExceptionMessage, "HydraRingUncertaintiesType"));
+            }
+        }
+
         private void InitializeHydraulicModelsConfiguration(Dictionary<string, List<OrderedDictionary>> configurationDictionary)
         {
             configurationDictionary["HydraulicModels"] = new List<OrderedDictionary>
             {
                 new OrderedDictionary
                 {
                     {
-                        "TimeIntegrationSchemeID", HydraRingTimeIntegrationSchemeType != null ? (int?) HydraRingTimeIntegrationSchemeType : null
+                        "TimeIntegrationSchemeID", (int?) HydraRingTimeIntegrationSchemeType
                     },
                     {
-                        "UncertaintiesID", HydraRingUncertaintiesType != null ? (int?) HydraRingUncertaintiesType : null
+                        "UncertaintiesID", (int?) HydraRingUncertaintiesType
                     },
                     {
                         "DataSetName", "WTI 2017" // Fixed: use the WTI 2017 set of station locations