one more fix in previous commit related to bullet_client.py

examples/pybullet/gym/pybullet_utils/bullet_client.py

@@ -41,6 +41,7 @@ class BulletClient(object):
   def __getattr__(self, name):
     """Inject the client id into Bullet functions."""
     attribute = getattr(pybullet, name)
+    if inspect.isbuiltin(attribute):
       attribute = functools.partial(attribute, physicsClientId=self._client)
     if name=="disconnect":
       self._client = -1