raising __getattribute__ causes unhandled exception in event loop

[linupi]

working on linux64 with ptpython 3.0.1 on top of python 3.7.7 I see the following difference between ptpython and native python command-line:

ptpython

>>> class Foo(): 
...     def __getattribute__(self,*args): 
...         raise Exception()                                                                                                                             

>>> f=Foo()                                                                                                                                               


Unhandled exception in event loop:
  File "... lib/python3.7/asyncio/events.py", line 88, in _run
    self._context.run(self._callback, *self._args)
  File "... lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 653, in read_from_input
    self.key_processor.process_keys()
  File "... lib/python3.7/site-packages/prompt_toolkit/key_binding/key_processor.py", line 274, in process_keys
    self._process_coroutine.send(key_press)
  File "... lib/python3.7/site-packages/prompt_toolkit/key_binding/key_processor.py", line 186, in _process
    self._call_handler(matches[-1], key_sequence=buffer[:])
  File "... lib/python3.7/site-packages/prompt_toolkit/key_binding/key_processor.py", line 329, in _call_handler
    handler.call(event)
  File "... lib/python3.7/site-packages/prompt_toolkit/key_binding/key_bindings.py", line 101, in call
    self.handler(event)
  File "... lib/python3.7/site-packages/ptpython/key_bindings.py", line 124, in _
    if b.validate():
  File "... lib/python3.7/site-packages/prompt_toolkit/buffer.py", line 1262, in validate
    self.validator.validate(self.document)
  File "... lib/python3.7/site-packages/prompt_toolkit/validation.py", line 175, in validate
    self.validator.validate(document)
  File "... lib/python3.7/site-packages/ptpython/validator.py", line 28, in validate
    flags = self.get_compiler_flags()
  File "... lib/python3.7/site-packages/ptpython/python_input.py", line 362, in get_compiler_flags
    if isinstance(value, __future__._Feature):
  File "<stdin>", line 3, in __getattribute__

Exception 
Press ENTER to continue... 

python cmd

>>> class Foo():
...   def __getattribute__(self,*args):
...     raise Exception()
... 
>>> f=Foo()
>>>

is this the desired/expected behavior of ptpython?