'NoneType' object has no attribute 'on_mqtt_connected_handler'

[Siecje]

Context

• OS and version used: Linux version 6.1.21-v8+
• Python version: 3.9.2
• pip version: 24.2
• list of installed packages:

Package             Version
------------------- -----------
async-timeout       4.0.3
atcom               0.4.3
azure-core          1.30.2
azure-iot-device    2.13.0
azure-storage-blob  12.22.0
bcrypt              4.1.3
bleak               0.20.1
certifi             2024.2.2
cffi                1.16.0
charset-normalizer  3.3.2
click               8.1.7
cryptography        3.2.1
dbus-fast           1.95.2
deprecation         2.1.0
exceptiongroup      1.2.2
idna                3.7
iniconfig           2.0.0
iotc                1.1.3
isodate             0.6.1
janus               1.0.0
numpy               1.26.4
packaging           24.0
paho-mqtt           1.6.1
pandas              2.2.2
paramiko            2.7.2
pip                 24.2
pkg_resources       0.0.0
pluggy              1.5.0
psutil              5.9.8
pycparser           2.22
PyNaCl              1.5.0
pyserial            3.5
PySocks             1.7.1
pytest              8.3.2
python-dateutil     2.9.0.post0
pytz                2024.1
PyYAML              6.0.1
pyzmq               25.1.2
requests            2.31.0
requests-unixsocket 0.3.0
RPi.GPIO            0.7.1
sentry-sdk          1.44.1
setuptools          72.1.0
six                 1.16.0
tomli               2.0.1
typing_extensions   4.11.0
tzdata              2024.1
urllib3             1.26.18
wheel               0.44.0

• cloned repo: <VERSION> ( If you are using a cloned sdk repository, in a command prompt: git describe )

Description of the issue

I get Sentry errors for 'NoneType' object has no attribute 'on_mqtt_connected_handler'. The traceback doesn't include my code just the code in the package. I'm not creating a thread in my code.

  File "threading.py", line 892, in run
    self._target(*self._args, **self._kwargs)
  File "paho/mqtt/client.py", line 3591, in _thread_main
    self.loop_forever(retry_first_connection=True)
  File "paho/mqtt/client.py", line 1756, in loop_forever
    rc = self._loop(timeout)
  File "paho/mqtt/client.py", line 1164, in _loop
    rc = self.loop_read()
  File "paho/mqtt/client.py", line 1556, in loop_read
    rc = self._packet_read()
  File "paho/mqtt/client.py", line 2439, in _packet_read
    rc = self._packet_handle()
  File "paho/mqtt/client.py", line 3039, in _packet_handle
    return self._handle_connack()
  File "paho/mqtt/client.py", line 3138, in _handle_connack
    on_connect(
  File "/opt/mixpilot/venv/lib/python3.9/site-packages/azure/iot/device/common/mqtt_transport.py", line 193, in on_connect
    elif this.on_mqtt_connected_handler:
AttributeError: 'NoneType' object has no attribute 'on_mqtt_connected_handler'

Code sample exhibiting the issue

The traceback doesn't include my code.

https://github.com/Azure/azure-iot-sdk-python/blob/2cbbed5e9231a78d79b333a267cb9c283add3fc6/azure-iot-device/azure/iot/device/common/mqtt_transport.py#L193

The change to use this was added in this commit. https://github.com/Azure/azure-iot-sdk-python/commit/2b5ffef41e56e5393402b9b843382274b4a7d54d

Console log of the issue

In the Sentry breadcrumbs I see

Provisioning process failed - ConnectionFailedError('Could not connect to IoTHub')