Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Create/ProjectCreateExtensions.cs
===================================================================
diff -u -r1eed3e3f652618c52a462edc502cfd4250772314 -r1c18575a6c396cd3c2d9d6079e4ed593871fc5f4
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Create/ProjectCreateExtensions.cs	(.../ProjectCreateExtensions.cs)	(revision 1eed3e3f652618c52a462edc502cfd4250772314)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Create/ProjectCreateExtensions.cs	(.../ProjectCreateExtensions.cs)	(revision 1c18575a6c396cd3c2d9d6079e4ed593871fc5f4)
@@ -21,7 +21,6 @@
 
 using System;
 using Application.Ringtoets.Storage.DbContext;
-using Core.Common.Base.Data;
 using Ringtoets.Integration.Data;
 
 namespace Application.Ringtoets.Storage.Create
Index: Application/Ringtoets/src/Application.Ringtoets.Storage/StorageSqLite.cs
===================================================================
diff -u -r1eed3e3f652618c52a462edc502cfd4250772314 -r1c18575a6c396cd3c2d9d6079e4ed593871fc5f4
--- Application/Ringtoets/src/Application.Ringtoets.Storage/StorageSqLite.cs	(.../StorageSqLite.cs)	(revision 1eed3e3f652618c52a462edc502cfd4250772314)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/StorageSqLite.cs	(.../StorageSqLite.cs)	(revision 1c18575a6c396cd3c2d9d6079e4ed593871fc5f4)
@@ -191,6 +191,11 @@
                 return true;
             }
 
+            if (!(project is RingtoetsProject))
+            {
+                throw new ArgumentNullException("project");
+            }
+
             using (var dbContext = new RingtoetsEntities(connectionString))
             {
                 try
Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/StorageSqLiteTest.cs
===================================================================
diff -u -r1eed3e3f652618c52a462edc502cfd4250772314 -r1c18575a6c396cd3c2d9d6079e4ed593871fc5f4
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/StorageSqLiteTest.cs	(.../StorageSqLiteTest.cs)	(revision 1eed3e3f652618c52a462edc502cfd4250772314)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/StorageSqLiteTest.cs	(.../StorageSqLiteTest.cs)	(revision 1c18575a6c396cd3c2d9d6079e4ed593871fc5f4)
@@ -504,6 +504,32 @@
         }
 
         [Test]
+        public void HasChanges_ValidProjectLoadedParamIsNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            StorageSqLite storageSqLite = new StorageSqLite();
+
+            FileDisposeHelper fileDisposeHelper = new FileDisposeHelper(tempRingtoetsFile);
+            try
+            {
+                SqLiteDatabaseHelper.CreateValidRingtoetsDatabase(tempRingtoetsFile, new RingtoetsProject());
+                storageSqLite.LoadProject(tempRingtoetsFile);
+
+                // Call
+                TestDelegate call = () => storageSqLite.HasChanges(null);
+
+                // Assert
+                var paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+                Assert.AreEqual("project", paramName);
+            }
+            finally
+            {
+                CallGarbageCollector();
+                fileDisposeHelper.Dispose();
+            }
+        }
+
+        [Test]
         public void HasChanges_NoConnectionSet_ReturnsTrue()
         {
             // Setup