diff --git a/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php b/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php
index 3d453a2b8ecb..0f46cc8696da 100644
--- a/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php
+++ b/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php
@@ -559,7 +559,7 @@ protected function getClassCastableAttributeValue($key)
             $caster = $this->resolveCasterClass($key);
 
             return $this->classCastCache[$key] = $caster instanceof CastsInboundAttributes
-                ? $this->attributes[$key]
+                ? ($this->attributes[$key] ?? null)
                 : $caster->get($this, $key, $this->attributes[$key] ?? null, $this->attributes);
         }
     }
diff --git a/tests/Database/DatabaseEloquentModelTest.php b/tests/Database/DatabaseEloquentModelTest.php
index b3d2ccc4d77a..c2f5b6121e54 100755
--- a/tests/Database/DatabaseEloquentModelTest.php
+++ b/tests/Database/DatabaseEloquentModelTest.php
@@ -7,6 +7,7 @@
 use DateTimeInterface;
 use Exception;
 use Foo\Bar\EloquentModelNamespacedStub;
+use Illuminate\Contracts\Database\Eloquent\CastsInboundAttributes;
 use Illuminate\Contracts\Events\Dispatcher;
 use Illuminate\Database\Connection;
 use Illuminate\Database\ConnectionResolverInterface;
@@ -2068,6 +2069,14 @@ public function testGetOriginalCastsAttributes()
         $this->assertEquals(['foo' => 'bar'], $model->getOriginal('collectionAttribute')->toArray());
         $this->assertEquals(['foo' => 'bar2'], $model->getAttribute('collectionAttribute')->toArray());
     }
+
+    public function testUnsavedModel()
+    {
+        $user = new UnsavedModel;
+        $user->name = null;
+
+        $this->assertNull($user->name);
+    }
 }
 
 class EloquentTestObserverStub
@@ -2493,3 +2502,16 @@ class EloquentModelWithUpdatedAtNull extends Model
     protected $table = 'stub';
     const UPDATED_AT = null;
 }
+
+class UnsavedModel extends Model
+{
+    protected $casts = ['name' => Uppercase::class];
+}
+
+class Uppercase implements CastsInboundAttributes
+{
+    public function set($model, string $key, $value, array $attributes)
+    {
+        return is_string($value) ? strtoupper($value) : $value;
+    }
+}