"cannot join current thread" error printed to console for meshing session which is not closed

[millerj97]

🔍 Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

🐞 Description of the bug

Calling a function multiple times which launches fluent meshing session such as below;

import ansys.fluent.core as pyfluent

def run_session():
    new_session =  pyfluent.launch_fluent(mode='meshing')
    print(new_session)
    return

run_session()
run_session()

The below exception is printed to the console if the sessions are not explicitly closed. Based on the message the exception has been handled but is still printed?;

Exception ignored in: <finalize object at ; dead>
Traceback (most recent call last):
  File "/usr/lib/python3.10/weakref.py", line 591, in __call__
    return info.func(*info.args, **(info.kwargs or {}))
  File "/.env/lib/python3.10/site-packages/ansys/fluent/core/fluent_connection.py", line 928, in _exit
    cb()
  File "/.env/lib/python3.10/site-packages/ansys/fluent/core/streaming_services/streaming.py", line 115, in stop
    self._stream_thread.join(timeout=5)
  File "/usr/lib/python3.10/threading.py", line 1093, in join
    raise RuntimeError("cannot join current thread")
RuntimeError: cannot join current thread

I have only been able to reproduce this error if the sessions are launched with the same name inside the function, and only for meshing mode

📝 Steps to reproduce

run the below in a script;

import ansys.fluent.core as pyfluent

def run_session():
    new_session =  pyfluent.launch_fluent(mode='meshing')
    print(new_session)
    # new_session.exit()
    return

run_session()
run_session()

repeat with mode="solver" and see no error
uncomment exit() and see no error

💻 Which operating system are you using?

Linux

📀 Which ANSYS version are you using?

No response

🐍 Which Python version are you using?

3.10

📦 Installed packages

ansys-api-fluent==0.3.36
ansys-api-platform-instancemanagement==1.1.3
ansys-api-tools-filetransfer==0.1.2
ansys-fluent-core==0.37.0
ansys-platform-instancemanagement==1.1.2
ansys-tools-common==0.3.1
ansys-tools-filetransfer==0.2.0
ansys-tools-local-product-launcher==0.2.0
ansys-units==0.9.1
appdirs==1.4.4
certifi==2025.11.12
charset-normalizer==3.4.4
click==8.3.1
defusedxml==0.7.1
Deprecated==1.3.1
docker==7.1.0
googleapis-common-protos==1.72.0
grpcio==1.76.0
grpcio-health-checking==1.62.3
grpcio-status==1.62.3
idna==3.11
importlib_metadata==8.7.0
joblib==1.5.2
nltk==3.9.2
numpy==2.2.6
pandas==2.3.3
platformdirs==4.5.1
protobuf==4.25.8
pyansys-tools-report==0.9.0
python-dateutil==2.9.0.post0
pytz==2025.2
PyYAML==6.0.3
regex==2025.11.3
requests==2.32.5
scooby==0.11.0
six==1.17.0
tqdm==4.67.1
typing_extensions==4.15.0
tzdata==2025.2
urllib3==2.6.0
wrapt==2.0.1
zipp==3.23.0