diff --git a/src/PhenX.EntityFrameworkCore.BulkInsert/Metadata/ColumnMetadata.cs b/src/PhenX.EntityFrameworkCore.BulkInsert/Metadata/ColumnMetadata.cs
index aedcfab..baf9a76 100644
--- a/src/PhenX.EntityFrameworkCore.BulkInsert/Metadata/ColumnMetadata.cs
+++ b/src/PhenX.EntityFrameworkCore.BulkInsert/Metadata/ColumnMetadata.cs
@@ -24,7 +24,7 @@ internal sealed class ColumnMetadata(IProperty property,  SqlDialectBuilder dial
 
     public bool IsGenerated { get; } = property.ValueGenerated != ValueGenerated.Never;
 
-    public object? GetValue(object entity, BulkInsertOptions options)
+    public object GetValue(object entity, BulkInsertOptions options)
     {
         var result = _getter(entity);
 
@@ -40,7 +40,7 @@ internal sealed class ColumnMetadata(IProperty property,  SqlDialectBuilder dial
             }
         }
 
-        return result;
+        return result ?? DBNull.Value;
     }
 
     private static Func<object, object?> BuildGetter(IProperty property)
diff --git a/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/JsonDbObject.cs b/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/JsonDbObject.cs
new file mode 100644
index 0000000..1c138df
--- /dev/null
+++ b/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/JsonDbObject.cs
@@ -0,0 +1,8 @@
+namespace PhenX.EntityFrameworkCore.BulkInsert.Tests.DbContext;
+
+public class JsonDbObject
+{
+    public int Code { get; set; }
+
+    public string Name { get; set; } = string.Empty;
+}
diff --git a/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestDbContext.cs b/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestDbContext.cs
index 07916ea..57f3f08 100644
--- a/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestDbContext.cs
+++ b/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestDbContext.cs
@@ -36,7 +36,8 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
 
         modelBuilder.Entity<TestEntityWithJson>(b =>
         {
-            b.Property(x => x.Json).AsJsonString("jsonb");
+            b.Property(x => x.JsonArray).AsJsonString("jsonb");
+            b.Property(x => x.JsonObject).AsJsonString("jsonb");
         });
 
         modelBuilder.Entity<TestEntity>(b =>
@@ -54,7 +55,8 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
 
         modelBuilder.Entity<TestEntityWithJson>(b =>
         {
-            b.Property(x => x.Json).AsJsonString("json");
+            b.Property(x => x.JsonArray).AsJsonString("json");
+            b.Property(x => x.JsonObject).AsJsonString("json");
         });
 
         modelBuilder.Entity<TestEntity>(b =>
@@ -72,7 +74,8 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
 
         modelBuilder.Entity<TestEntityWithJson>(b =>
         {
-            b.Property(x => x.Json).AsJsonString(null);
+            b.Property(x => x.JsonArray).AsJsonString(null);
+            b.Property(x => x.JsonObject).AsJsonString(null);
         });
 
         modelBuilder.Entity<TestEntity>(b =>
@@ -90,7 +93,8 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
 
         modelBuilder.Entity<TestEntityWithJson>(b =>
         {
-            b.Property(x => x.Json).AsJsonString(null);
+            b.Property(x => x.JsonArray).AsJsonString(null);
+            b.Property(x => x.JsonObject).AsJsonString(null);
         });
 
         modelBuilder.Entity<TestEntity>(b =>
@@ -108,7 +112,8 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
 
         modelBuilder.Entity<TestEntityWithJson>(b =>
         {
-            b.Property(x => x.Json).AsJsonString(null);
+            b.Property(x => x.JsonArray).AsJsonString(null);
+            b.Property(x => x.JsonObject).AsJsonString(null);
         });
 
         modelBuilder.Entity<TestEntity>(b =>
diff --git a/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestEntity.cs b/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestEntity.cs
index b679c32..03a9172 100644
--- a/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestEntity.cs
+++ b/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestEntity.cs
@@ -22,6 +22,13 @@ public class TestEntity : TestEntityBase
     [Column("the_identifier")]
     public Guid Identifier { get; set; }
 
+    [Column("nullable_identifier")]
+    public Guid? NullableIdentifier { get; set; }
+
+    public DateTime Created { get; set; }
+
+    public DateTime? Modified { get; set; }
+
     [Column("string_enum_value")]
     public StringEnum StringEnumValue { get; set; }
 
diff --git a/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestEntityWithJson.cs b/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestEntityWithJson.cs
index dbde0b1..3742dd6 100644
--- a/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestEntityWithJson.cs
+++ b/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/DbContext/TestEntityWithJson.cs
@@ -9,5 +9,7 @@ public class TestEntityWithJson : TestEntityBase
     [Key]
     public int Id { get; set; }
 
-    public List<int> Json { get; set; } = [];
+    public List<int> JsonArray { get; set; } = [];
+
+    public JsonDbObject JsonObject { get; set; }
 }
diff --git a/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/Tests/Basic/BasicTestsBase.cs b/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/Tests/Basic/BasicTestsBase.cs
index 13c114c..e69354f 100644
--- a/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/Tests/Basic/BasicTestsBase.cs
+++ b/tests/PhenX.EntityFrameworkCore.BulkInsert.Tests/Tests/Basic/BasicTestsBase.cs
@@ -54,8 +54,16 @@ public async Task InsertEntities_WithJson(InsertStrategy strategy)
         // Arrange
         var entities = new List<TestEntityWithJson>
         {
-            new TestEntityWithJson { Json = [1] },
-            new TestEntityWithJson { Json = [2] }
+            new TestEntityWithJson
+            {
+                JsonArray = [1],
+                JsonObject = new JsonDbObject { Code = 1, Name = "Test1" },
+            },
+            new TestEntityWithJson
+            {
+                JsonArray = [2],
+                JsonObject = new JsonDbObject { Code = 2, Name = "Test2" },
+            },
         };
 
         // Act