mitmproxy node

[mitmproxy-node plugin] Unexpected error: (<class 'TypeError'>, TypeError("'Lock' object is not iterable"), <traceback object at 0x103db7bc0>)
Traceback (most recent call last):
  File "/Users/saikrishna/Downloads/git/mitproxyappium/node_modules/mitmproxy/scripts/proxy.py", line 224, in websocket_loop
    await websocket.ping()
  File "/Users/saikrishna/Library/Python/3.9/lib/python/site-packages/websockets/protocol.py", line 456, in ping
    yield from self.write_frame(OP_PING, data)
  File "/Users/saikrishna/Library/Python/3.9/lib/python/site-packages/websockets/protocol.py", line 740, in write_frame
    with (yield from self._drain_lock):
TypeError: 'Lock' object is not iterable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/saikrishna/Downloads/git/mitproxyappium/node_modules/mitmproxy/scripts/proxy.py", line 238, in websocket_loop
    pass
  File "/Users/saikrishna/Library/Python/3.9/lib/python/site-packages/websockets/py35/client.py", line 6, in __aexit__
    await self.ws_client.close()
  File "/Users/saikrishna/Library/Python/3.9/lib/python/site-packages/websockets/protocol.py", line 391, in close
    yield from asyncio.wait_for(
  File "/Users/saikrishna/Downloads/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/asyncio/tasks.py", line 481, in wait_for
    return fut.result()
  File "/Users/saikrishna/Library/Python/3.9/lib/python/site-packages/websockets/protocol.py", line 786, in write_close_frame
    yield from self.write_frame(OP_CLOSE, data, State.CLOSING)
  File "/Users/saikrishna/Library/Python/3.9/lib/python/site-packages/websockets/protocol.py", line 740, in write_frame
    with (yield from self._drain_lock):
TypeError: 'Lock' object is not iterable
[mitmproxy-node plugin] Unexpected error: (<class 'TypeError'>, TypeError("'Lock' object is not iterable"), <traceback object at 0x103df5340>)
Traceback (most recent call last):
  File "/Users/saikrishna/Downloads/git/mitproxyappium/node_modules/mitmproxy/scripts/proxy.py", line 224, in websocket_loop
    await websocket.ping()
  File "/Users/saikrishna/Library/Python/3.9/lib/python/site-packages/websockets/protocol.py", line 456, in ping
    yield from self.write_frame(OP_PING, data)
  File "/Users/saikrishna/Library/Python/3.9/lib/python/site-packages/websockets/protocol.py", line 740, in write_frame
    with (yield from self._drain_lock):
TypeError: 'Lock' object is not iterable