AttributeError: 'SSTPProtocol' object has no attribute 'transport'

[arpitest]

i keep getting such errors dumped to stderr, probably caused by non-sstp clients tryting to connect to the server:

2023-04-03 08:02:26,470 ERROR: Exception in callback SSTPProtocol.hello_timer_expired(close=False)() handle: <TimerHandle when=33316.876951445 SSTPProtocol.hello_timer_expired(close=False)()> Traceback (most recent call last): File "/usr/lib64/python3.7/asyncio/events.py", line 88, in _run self._context.run(self._callback, *self._args) File "/usr/lib64/python3.7/site-packages/sstp_server-0.6.0-py3.7-linux-x86_64.egg/sstpd/sstp.py", line 532, in hello_timer_expired self.transport.close() # TODO: follow HTTP AttributeError: 'SSTPProtocol' object has no attribute 'transport'