RuntimeError when using python debugger

@mbkupfer wrote:

@chriddyp I just got an example of how the debugger goes buggy when setting a trace in a callback. Decided to just move this to a new thread as it was getting unrelated.

Any idea what this could be based on the traceback below?

Btw, I’m using

dash                 1.11.0 
dash-core-components 1.9.1  
dash-gif-component   1.0.2  
dash-html-components 1.0.3  
dash-renderer        1.4.0  
dash-table           4.6.2  

Exception in thread Thread-193:
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "/Users/mkupfer/Interactive-Tools/iece/venv/lib/python3.7/site-packages/IPython/terminal/debugger.py", line 102, in in_thre
ad
    line = self.pt_app.prompt()
  File "/Users/mkupfer/Interactive-Tools/iece/venv/lib/python3.7/site-packages/prompt_toolkit/shortcuts/prompt.py", line 994, in p
rompt
    return self.app.run(set_exception_handler=set_exception_handler)
  File "/Users/mkupfer/Interactive-Tools/iece/venv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 81
2, in run
    self.run_async(pre_run=pre_run, set_exception_handler=set_exception_handler)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/base_events.py", line 584, in run_until_complete
    return future.result()
  File "/Users/mkupfer/Interactive-Tools/iece/venv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 77
8, in run_async
    return await _run_async2()
  File "/Users/mkupfer/Interactive-Tools/iece/venv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 76
6, in _run_async2
    await self.cancel_and_wait_for_background_tasks()
  File "/Users/mkupfer/Interactive-Tools/iece/venv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 86
7, in cancel_and_wait_for_background_tasks
    await task
RuntimeError: Task <Task pending coro=<Application.run_async() running at /Users/mkupfer/Interactive-Tools/iece/venv/lib/python3.7
/site-packages/prompt_toolkit/application/application.py:778> cb=[_run_until_complete_cb() at /Library/Frameworks/Python.framework
/Versions/3.7/lib/python3.7/asyncio/base_events.py:158]> got Future <Task pending coro=<KeyProcessor._start_timeout.<locals>.wait$

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