diff --git a/python/paddle/fluid/dygraph/layers.py b/python/paddle/fluid/dygraph/layers.py
index 088fed03c35957ea4a2040354537c8ec0ad86717..6392b0d1151b7ffb83d21c9e49e82ef08368abb7 100644
--- a/python/paddle/fluid/dygraph/layers.py
+++ b/python/paddle/fluid/dygraph/layers.py
@@ -1582,7 +1582,8 @@ class Layer(object):
                                             blocking)
 
         for key, buf in self._buffers.items():
-            self._buffers[key] = func(buf, device, dtype, blocking)
+            if buf is not None:
+                self._buffers[key] = func(buf, device, dtype, blocking)
 
         self._dtype = dtype
 
diff --git a/python/paddle/fluid/tests/unittests/test_base_layer.py b/python/paddle/fluid/tests/unittests/test_base_layer.py
index 3bdd03b32127642dcfa33b04fdb7a78f9a1fc0a7..ab5ce774692869ce60d0294c7dbc6b9cb9996c4c 100644
--- a/python/paddle/fluid/tests/unittests/test_base_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_base_layer.py
@@ -544,16 +544,25 @@ class TestLayerTo(unittest.TestCase):
             else:
                 self.assertTrue(isinstance(p, paddle.fluid.framework.ParamBase))
 
+    def func_test_to_api_none_buffer(self):
+        model = paddle.nn.Linear(2, 4)
+        buffer = None
+        model.register_buffer("buf_name", buffer, persistable=True)
+        model.to(dtype='float64')
+        self.assertEqual(model._buffers['buf_name'], None)
+
     def test_main(self):
         with _test_eager_guard():
             self.funcsetUp()
             self.func_test_to_api()
             self.func_test_to_api_paddle_dtype()
             self.func_test_to_api_numpy_dtype()
+            self.func_test_to_api_none_buffer()
         self.funcsetUp()
         self.func_test_to_api()
         self.func_test_to_api_paddle_dtype()
         self.func_test_to_api_numpy_dtype()
+        self.func_test_to_api_none_buffer()
 
 
 if __name__ == '__main__':