Question: I have this (very simplified) program running with trio as base async library and with trio_asyncio library allowing me to call asyncio methods too: import asyncio import trio import trio_asyncio async def async_main(*args): print('async_main start') async with trio_asyncio.open_loop() as loop: print('async_main before trio sleep') await trio.sleep(1) print('async_main before asyncio sleep') await trio_asyncio.aio_as_trio(asyncio.sleep)(2) print('async_main after sleeps') print('async_main stop') if __name__ == '__main__': print('main start') trio.run(async_main) print('main stop')  It works well, if I run it from PyCharm: main start async_main start async_main before trio sleep async_main before asyncio sleep async_main after sleeps async_main stop main stop  But if I run the same code from PyCharm in debug mode (menu Run / Debug), then it raises an exception: Connected to pydev debugger (build 232.9559.58) main start async_main start async_main before trio sleep async_main before asyncio sleep Traceback (most recent call last): File "/home/vaclav/.config/JetBrains/PyCharmCE2023.2/scratches/scratch_3.py", line 12, in async_main await trio_asyncio.aio_as_trio(asyncio.sleep)(2) File "/home/vaclav/.cache/pypoetry/virtualenvs/maybankwithoutselenium-RhkLw-zs-py3.11/lib/python3.11/site-packages/trio_asyncio/_adapter.py", line 54, in __call__ return await self.loop.run_aio_coroutine(f) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/vaclav/.cache/pypoetry/virtualenvs/maybankwithoutselenium-RhkLw-zs-py3.11/lib/python3.11/site-packages/trio_asyncio/_base.py", line 214, in run_aio_coroutine fut = asyncio.ensure_future(coro, loop=self) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/pycharm-community/plugins/python-ce/helpers/pydev/_pydevd_asyncio_util/pydevd_nest_asyncio.py", line 156, in ensure_future return loop.create_task(coro_or_future) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.11/asyncio/base_events.py", line 436, in create_task task = tasks.Task(coro, loop=self, name=name, context=context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/pycharm-community/plugins/python-ce/helpers/pydev/_pydevd_asyncio_util/pydevd_nest_asyncio.py", line 390, in task_new_init self._loop.call_soon(self, context=self._context) File "/home/vaclav/.cache/pypoetry/virtualenvs/maybankwithoutselenium-RhkLw-zs-py3.11/lib/python3.11/site-packages/trio_asyncio/_base.py", line 312, in call_soon self._check_callback(callback, 'call_soon') File "/usr/lib/python3.11/asyncio/base_events.py", line 776, in _check_callback raise TypeError( TypeError: a callable object was expected by call_soon(), got <Task pending name='Task-1' coro=<_call_defer() running at /home/vaclav/.cache/pypoetry/virtualenvs/maybankwithoutselenium-RhkLw-zs-py3.11/lib/python3.11/site-packages/trio_asyncio/_adapter.py:16>> python-BaseException sys:1: RuntimeWarning: coroutine '_call_defer' was never awaited Exception in default exception handler Traceback (most recent call last): File "/usr/lib/python3.11/asyncio/base_events.py", line 1797, in call_exception_handler self.default_exception_handler(context) File "/home/vaclav/.cache/pypoetry/virtualenvs/maybankwithoutselenium-RhkLw-zs-py3.11/lib/python3.11/site-packages/trio_asyncio/_async.py", line 42, in default_exception_handler raise RuntimeError(message) RuntimeError: Task was destroyed but it is pending! Process finished with exit code 1  The source code is copied from the official trio_asyncio documentation. I have two questions:  Why the code works well if it is run without debugging, and why it fails when it is run in debugger? How I should modify this code to be able still call both - trio and asyncio methods and it will be possible to use debugger with such code? 

Answer: This helped me:  open Actions search window (press shift twice and switch to Actions tab) type Registry, choose the Registry... item switch off (deselect) the python.debug.asyncio.repl property  Thanks to Jetbrains support for help: PY-65970