az fails in multiple threads

[Sergei-Vorobyov]

Greetings!

az works great in one thread, but fails in 2 and more. I am just executing an innocent command, it always fails in 2, 3 threads.

    cmd = 'ad signed-in-user show --query "userPrincipalName"'
    logger.info(f'will run: {cmd}')
    exit_code, result, logs = az(cmd)

Exception in thread aks-stage-3se:
Traceback (most recent call last):
  File "/usr/local/Cellar/python@3.8/3.8.6/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/usr/local/Cellar/python@3.8/3.8.6/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "mainA.py", line 211, in process_cluster
    cluster_summary()
  File "mainA.py", line 178, in cluster_summary
    exit_code, result, logs = az(cmd)
  File "/Users/vorobyov001/tre/PycharmProjects/011-key-vault/az-ad/zvenv/lib/python3.8/site-packages/az/cli.py", line 89, in az
    exit_code = _cli.invoke(
  File "/Users/vorobyov001/tre/PycharmProjects/011-key-vault/az-ad/zvenv/lib/python3.8/site-packages/knack/cli.py", line 233, in invoke
    self.raise_event(EVENT_CLI_POST_EXECUTE)
  File "/Users/vorobyov001/tre/PycharmProjects/011-key-vault/az-ad/zvenv/lib/python3.8/site-packages/knack/cli.py", line 164, in raise_event
    func(self, **kwargs)
  File "/Users/vorobyov001/tre/PycharmProjects/011-key-vault/az-ad/zvenv/lib/python3.8/site-packages/azure/cli/core/azlogging.py", line 180, in deinit_cmd_metadata_logging
    cli_ctx.logging.end_cmd_metadata_logging(cli_ctx.result.exit_code if cli_ctx.result else 128)
  File "/Users/vorobyov001/tre/PycharmProjects/011-key-vault/az-ad/zvenv/lib/python3.8/site-packages/azure/cli/core/azlogging.py", line 190, in end_cmd_metadata_logging
    self.command_metadata_logger.removeHandler(self.command_logger_handler)
AttributeError: 'NoneType' object has no attribute 'removeHandler'