diff --git a/src/bone.js b/src/bone.js
index a6f481f7..7786c291 100644
--- a/src/bone.js
+++ b/src/bone.js
@@ -183,7 +183,6 @@ class Bone {
     }
 
     if (args.length > 1) {
-      // execute validators
       this.#raw[name] = value instanceof Raw ? value : attribute.cast(value);
       this.#rawUnset.delete(name);
       return this;
diff --git a/src/drivers/abstract/attribute.js b/src/drivers/abstract/attribute.js
index 3a3c33a0..18fde7fe 100644
--- a/src/drivers/abstract/attribute.js
+++ b/src/drivers/abstract/attribute.js
@@ -123,7 +123,8 @@ class Attribute {
   }
 
   cast(value) {
-    return this.type.cast(value);
+    const castedValue = this.type.cast(value);
+    return castedValue == null? null : castedValue;
   }
 
   uncast(value, strict = true) {
diff --git a/test/integration/suite/basics.test.js b/test/integration/suite/basics.test.js
index 9a5e234f..1e037a4f 100644
--- a/test/integration/suite/basics.test.js
+++ b/test/integration/suite/basics.test.js
@@ -195,9 +195,12 @@ describe('=> Basic', () => {
       assert.deepEqual(post.previousChanges('title'), {});
       await post.save();
       assert.deepEqual(post.previousChanges('title'), {});
+      assert.deepEqual(post.previousChanges('authorId'), { });
       post.title = 'MHW';
+      post.authorId = 100;
       await post.save();
       assert.deepEqual(post.previousChanges('title'), { title: [ 'Untitled', 'MHW' ] });
+      assert.deepEqual(post.previousChanges('authorId'), { authorId: [ null, 100 ] });
       // should return {} if key does not exist
       assert.deepEqual(post.previousChanges('notExisted'), {});
     });
@@ -208,10 +211,11 @@ describe('=> Basic', () => {
       await post.save();
       assert.deepEqual(post.previousChanges(), {});
       post.title = 'MHW';
+      post.authorId = 100;
       const prevUpdatedAt = post.updatedAt;
       await sleep(10);
       await post.save();
-      assert.deepEqual(post.previousChanges(), { title: [ 'Untitled', 'MHW' ], updatedAt: [ prevUpdatedAt, post.updatedAt ] });
+      assert.deepEqual(post.previousChanges(), { authorId: [ null, 100 ], title: [ 'Untitled', 'MHW' ], updatedAt: [ prevUpdatedAt, post.updatedAt ] });
     });
 
     it('Bone.changes(key): raw VS rawSaved', async function () {
diff --git a/test/integration/suite/data_types.test.js b/test/integration/suite/data_types.test.js
index aa7b6531..faa8d15e 100644
--- a/test/integration/suite/data_types.test.js
+++ b/test/integration/suite/data_types.test.js
@@ -118,6 +118,9 @@ describe('=> Data types - JSON', () => {
     assert.deepEqual(note3.meta, [ 1, 2, 3 ]);
     await note3.reload();
     assert.deepEqual(note3.meta, [ 1, 2, 3 ]);
+    assert.deepEqual(note3.body, null);
+    assert.deepEqual(note3.isPrivate, null);
+    assert.notEqual(note3.id, null);
 
     const note4 = await Note.findOne({ meta: { $like: '%1,2,3%' }});
     assert.deepEqual(note3.toJSON(), note4.toJSON());
diff --git a/test/unit/adapters/sequelize.test.js b/test/unit/adapters/sequelize.test.js
index 52dd036b..1bab018c 100644
--- a/test/unit/adapters/sequelize.test.js
+++ b/test/unit/adapters/sequelize.test.js
@@ -1043,6 +1043,13 @@ describe('=> Sequelize adapter', () => {
       updatedAt: post.updatedAt,
       createdAt: post.createdAt,
       wordCount: 0,
+      authorId: null,
+      content: null,
+      deletedAt: null,
+      extra: null,
+      settings: null,
+      summary: null,
+      thumb: null,
     });
     post.content = 'a';
     assert.deepEqual(post.previous(), {
@@ -1052,6 +1059,13 @@ describe('=> Sequelize adapter', () => {
       updatedAt: post.updatedAt,
       createdAt: post.createdAt,
       wordCount: 0,
+      authorId: null,
+      content: null,
+      deletedAt: null,
+      extra: null,
+      settings: null,
+      summary: null,
+      thumb: null,
     });
     const prevUpdatedAt = post.updatedAt;
     await post.update();
@@ -1062,6 +1076,13 @@ describe('=> Sequelize adapter', () => {
       updatedAt: prevUpdatedAt,
       createdAt: post.createdAt,
       wordCount: 0,
+      authorId: null,
+      content: null,
+      deletedAt: null,
+      extra: null,
+      settings: null,
+      summary: null,
+      thumb: null,
     });
   });