loguru: Logging error in Loguru Handler: TypeError: __init__() missing 1 required positional argument: 'message'

Hello,

i am getting the following error message sometimes which makes me assume that somewhere in my application i am writing None the logger.

--- Logging error in Loguru Handler #2 ---
Record was: None
Traceback (most recent call last):
  File "/home/.../lib/python3.8/site-packages/loguru/_handler.py", line 265, in _queued_writer
    message = queue.get()
  File "/home/.../lib/python3.8/multiprocessing/queues.py", line 358, in get
    return _ForkingPickler.loads(res)
TypeError: __init__() missing 1 required positional argument: 'message'
--- End of logging error ---

A review did not yield the place where it happens. So i wonder how could i find out the place which writes a None to the logger… The traceback is decoupled from the place where the message gets put, so i am searching for the correct place where i should put the check for a possible None.