Error: There is no current event loop in thread 'MainThread'

[AlekseyPython]

Python 3.7.2

In my processing, the main function is wrapped by error interceptors and the interception is performed correctly:

try:
    downloader = Downloader.Downloader()
    downloader.download()
except Exception as err:
    General.exist_error = True
    Events.Sender.send_error(err)

But if an error occurred (and was correctly intercepted!), then the following start of processing fall down on the line:

self.event_exist_data = Event()

with error:

Error:
There is no current event loop in thread 'MainThread'

I found the place of the code in which the error occurs (module events):

class BaseDefaultEventLoopPolicy(AbstractEventLoopPolicy):
...
    def get_event_loop(self):
        """Get the event loop.

        This may be None or an instance of EventLoop.
        """
        if (self._local._loop is None and #TRUE
                not self._local._set_called and #FALSE BECAUSE self._local._set_called IS TRUE !!!
                isinstance(threading.current_thread(), threading._MainThread)): #TRUE
            self.set_event_loop(self.new_event_loop())

        if self._local._loop is None:
            raise RuntimeError('There is no current event loop in thread %r.' #On the second, third ... iteration I get here!!!
                               % threading.current_thread().name)

        return self._local._loop