diff --git a/python/convert.c b/python/convert.c
index 2b3a4e3dd1..b37ca481d9 100644
--- a/python/convert.c
+++ b/python/convert.c
@@ -214,6 +214,10 @@ static bool PyUpb_PyToUpbEnum(PyObject* obj, const upb_FieldDef* f,
 bool PyUpb_IsNumpyNdarray(PyObject* obj, const upb_FieldDef* f) {
   PyObject* type_name_obj =
       PyObject_GetAttrString((PyObject*)Py_TYPE(obj), "__name__");
+  if (!type_name_obj) {
+    PyErr_Clear();
+    return false;
+  }
   bool is_ndarray = false;
   if (!strcmp(PyUpb_GetStrData(type_name_obj), "ndarray")) {
     PyErr_Format(PyExc_TypeError,
@@ -228,6 +232,10 @@ bool PyUpb_IsNumpyNdarray(PyObject* obj, const upb_FieldDef* f) {
 bool PyUpb_IsNumpyBoolScalar(PyObject* obj) {
   PyObject* type_module_obj =
       PyObject_GetAttrString((PyObject*)Py_TYPE(obj), "__module__");
+  if (!type_module_obj) {
+    PyErr_Clear();
+    return false;
+  }
   bool is_numpy = !strcmp(PyUpb_GetStrData(type_module_obj), "numpy");
   Py_DECREF(type_module_obj);
   if (!is_numpy) {
@@ -236,6 +244,10 @@ bool PyUpb_IsNumpyBoolScalar(PyObject* obj) {
 
   PyObject* type_name_obj =
       PyObject_GetAttrString((PyObject*)Py_TYPE(obj), "__name__");
+  if (!type_name_obj) {
+    PyErr_Clear();
+    return false;
+  }
   bool is_bool = !strcmp(PyUpb_GetStrData(type_name_obj), "bool");
   Py_DECREF(type_name_obj);
   if (!is_bool) {
diff --git a/python/google/protobuf/internal/message_factory_test.py b/python/google/protobuf/internal/message_factory_test.py
index 825f5cd1a5..2c21a17940 100644
--- a/python/google/protobuf/internal/message_factory_test.py
+++ b/python/google/protobuf/internal/message_factory_test.py
@@ -395,6 +395,21 @@ class MessageFactoryTest(unittest.TestCase):
     self.assertEqual('hello', values[0].key)
     self.assertEqual('welcome', values[0].value)
 
+  def testConvertNumpyDetectionNullAttribute(self):
+    class NamelessMeta(type):
+      def __getattribute__(cls, name):
+        if name == '__name__' or name == '__module__':
+          raise AttributeError('no attribute')
+        return super().__getattribute__(name)
+
+    class Nameless(metaclass=NamelessMeta):
+      def __index__(self):
+        return 42
+
+    msg = factory_test1_pb2.Factory1Message()
+    msg.scalar_value = Nameless()
+    self.assertEqual(msg.scalar_value, 42)
+
 
 if __name__ == '__main__':
   unittest.main()
diff --git a/python/google/protobuf/internal/type_checkers.py b/python/google/protobuf/internal/type_checkers.py
index a12f42661f..e959688d39 100755
--- a/python/google/protobuf/internal/type_checkers.py
+++ b/python/google/protobuf/internal/type_checkers.py
@@ -121,8 +121,8 @@ class BoolValueChecker(object):
     if not hasattr(proposed_value, '__index__'):
       # Under NumPy 2.3, numpy.bool does not have an __index__ method.
       if (
-          type(proposed_value).__module__ == 'numpy'
-          and type(proposed_value).__name__ == 'bool'
+          getattr(type(proposed_value), '__module__', None) == 'numpy'
+          and getattr(type(proposed_value), '__name__', None) == 'bool'
       ):
         return bool(proposed_value)
       message = '%.1024r has type %s, but expected one of: %s' % (
@@ -133,8 +133,8 @@ class BoolValueChecker(object):
       raise TypeError(message)
 
     if (
-        type(proposed_value).__module__ == 'numpy'
-        and type(proposed_value).__name__ == 'ndarray'
+        getattr(type(proposed_value), '__module__', None) == 'numpy'
+        and getattr(type(proposed_value), '__name__', None) == 'ndarray'
     ):
       message = '%.1024r has type %s, but expected one of: %s' % (
           proposed_value,
@@ -166,8 +166,8 @@ class IntValueChecker(object):
       raise TypeError(message)
 
     if not hasattr(proposed_value, '__index__') or (
-        type(proposed_value).__module__ == 'numpy'
-        and type(proposed_value).__name__ == 'ndarray'
+        getattr(type(proposed_value), '__module__', None) == 'numpy'
+        and getattr(type(proposed_value), '__name__', None) == 'ndarray'
     ):
       message = '%.1024r has type %s, but expected one of: %s' % (
           proposed_value,
@@ -301,8 +301,8 @@ class DoubleValueChecker(object):
         not hasattr(proposed_value, '__float__')
         and not hasattr(proposed_value, '__index__')
     ) or (
-        type(proposed_value).__module__ == 'numpy'
-        and type(proposed_value).__name__ == 'ndarray'
+        getattr(type(proposed_value), '__module__', None) == 'numpy'
+        and getattr(type(proposed_value), '__name__', None) == 'ndarray'
     ):
       message = '%.1024r has type %s, but expected one of: int, float' % (
           proposed_value,