Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/Handlers/HydraulicBoundaryDatabaseUpdateHandler.cs
===================================================================
diff -u -rcbe83a33648625a849a8f4afdd28a6d2f9bc4179 -rb67e84a1d4c08afc280f5b0e75ef0f7909873795
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/Handlers/HydraulicBoundaryDatabaseUpdateHandler.cs	(.../HydraulicBoundaryDatabaseUpdateHandler.cs)	(revision cbe83a33648625a849a8f4afdd28a6d2f9bc4179)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/Handlers/HydraulicBoundaryDatabaseUpdateHandler.cs	(.../HydraulicBoundaryDatabaseUpdateHandler.cs)	(revision b67e84a1d4c08afc280f5b0e75ef0f7909873795)
@@ -58,6 +58,16 @@
 
         public bool IsConfirmationRequired(HydraulicBoundaryDatabase hydraulicBoundaryDatabase, ReadHydraulicBoundaryDatabase readHydraulicBoundaryDatabase)
         {
+            if (hydraulicBoundaryDatabase == null)
+            {
+                throw new ArgumentNullException(nameof(hydraulicBoundaryDatabase));
+            }
+
+            if (readHydraulicBoundaryDatabase == null)
+            {
+                throw new ArgumentNullException(nameof(readHydraulicBoundaryDatabase));
+            }
+
             return hydraulicBoundaryDatabase.IsLinked() && hydraulicBoundaryDatabase.Version != readHydraulicBoundaryDatabase.Version;
         }