Deleting (unplugging) vController object causes application hanging

I use Python 3.6 64-bit on 64bit machine.
This project looks really cool, and I was able to use some different inputs to test and it was working. But now I have a problem.
Whenever I run virtual_controller.py the code hangs in this place:
print('Done, disconnecting controllers.')
del cons

def main():
    import time
    cons = []

    print('Testings multiple connections')
    while True:
        print('Connecting Controller:')
        try:
            cons.append(vController())
        except MaxInputsReachedError:
            break
        else:
            print('Available:', vController.available_ids())
            print('This ID:', cons[-1].id)

        # time.sleep(1)

    print('Done, disconnecting controllers.')
    del cons
    print('Available:', vController.available_ids())
    time.sleep(2)

I see the sentence and then I wait a few minutes and nothing happens. When I comment code above and use only this part...

    print('Testing Value setting')
    print('Connecting Controller:')
    try:
        con = vController()
    except MaxInputsReachedError:
        print('Unable to connect controller for testing.')
    else:
        print('This ID:', con.id)
        print('Available:', vController.available_ids())
        print('Setting TriggerR and AxisLx:')
        for x in range(11):
            val = x / 10
            print(val)
            con.set_value('TriggerR', val)
            con.set_value('AxisLx', val)
            time.sleep(0.5)

        print('Done, disconnecting controller.')
        del con
        print('Available:', vController.available_ids())
        time.sleep(2)

... it also hangs after printing: "Done, disconnecting controller."

When I stop process and then run again I have MaxInputsReachedError and I see:
"Unable to connect controller for testing."

So stopping the process is not a good idea because the virtual controller is not plugged off. And it causes that I cannot run the program correctly again. Also uninstalling the controller from device manager doesn't work. It also hangs.