Thanks George, this is a great question! I've expanded our tutorial to hopefully cover this a bit better... https://stem.torproject.org/tutorials/tortoise_and_the_hare.html#advanced-li... You can trivially print exceptions within your listener if that is all you care about... ======================================== import time import traceback from stem.control import EventType, Controller def broken_handler(event): try: raise ValueError('boom') except: print(traceback.format_exc()) with Controller.from_port() as controller: controller.authenticate() controller.add_event_listener(broken_handler, EventType.BW) time.sleep(2) ======================================== % python demo.py Traceback (most recent call last): File "demo.py", line 9, in broken_handler raise ValueError('boom') ValueError: boom Traceback (most recent call last): File "demo.py", line 9, in broken_handler raise ValueError('boom') ValueError: boom ======================================== ... but if your event handler has grown sophisticated enough to make this a significant issue I'd suggest a producer/consumer model as the tutorial now demonstrates. Cheers! -Damian