diff --git a/mindspore/ccsrc/pybind_api/ir/tensor_py.cc b/mindspore/ccsrc/pybind_api/ir/tensor_py.cc
index 56c549c9cd..2e68f24fb9 100644
--- a/mindspore/ccsrc/pybind_api/ir/tensor_py.cc
+++ b/mindspore/ccsrc/pybind_api/ir/tensor_py.cc
@@ -122,6 +122,8 @@ class TensorDataNumpy : public TensorData {
  public:
   explicit TensorDataNumpy(py::buffer_info &&buffer) : buffer_(std::move(buffer)) {}
 
+  ~TensorDataNumpy() override = default;
+
   /// Total number of elements.
   ssize_t size() const override { return buffer_.size; }
 
@@ -160,7 +162,7 @@ class TensorDataNumpy : public TensorData {
     return py::array(py::dtype(buffer_), buffer_.shape, buffer_.strides, buffer_.ptr, dummyOwner);
   }
 
- private:
+  // The internal buffer.
   py::buffer_info buffer_;
 };
 
@@ -258,7 +260,7 @@ py::array TensorPy::SyncAsNumpy(const Tensor &tensor) {
 
 py::array TensorPy::AsNumpy(const Tensor &tensor) {
   auto data_numpy = dynamic_cast<const TensorDataNumpy *>(&tensor.data());
-  if (data_numpy) {
+  if (data_numpy != nullptr) {
     // Return internal numpy array if tensor data is implemented base on it.
     return data_numpy->py_array();
   }