Latest version breaks something in the h11 implementation

[Wouterkoorn]

I'm using uvicorn to run a FastAPI application. I just download the latest uvicorn version 0.18.0 and got the following error when trying to run my app:

Fatal error: protocol.data_received() call failed.
protocol: <uvicorn.protocols.http.h11_impl.H11Protocol object at 0x7fcbc87089a0>
transport: <_SelectorSocketTransport fd=11 read=polling write=<idle, bufsize=0>>
Traceback (most recent call last):
  File "/.../python3.9/asyncio/selector_events.py", line 870, in _read_ready__data_received
    self._protocol.data_received(data)
  File "/.../venv/lib/python3.9/site-packages/uvicorn/protocols/http/h11_impl.py", line 161, in data_received
    self.handle_events()
  File "/.../venv/lib/python3.9/site-packages/uvicorn/protocols/http/h11_impl.py", line 166, in handle_events
    event = self.conn.next_event()
  File "/.../venv/lib/python3.9/site-packages/h11/_connection.py", line 471, in next_event
    if len(self._receive_buffer) > self._max_incomplete_event_size:
TypeError: '>' not supported between instances of 'int' and 'NoneType'

(I removed the full paths)

When going back to version 0.17.0, I don't encounter this error...

Please let me know if there is more details I can share.

[Kludex]

Thanks for reporting it that fast. :)

Would you mind checking if #1534 solves your issue?

EDIT: Tested here already, works fine with the PR. 👍

[Wouterkoorn]

Yes, that fixed it for me