Daylight savings bug

[NickSto]

1520733615 INFO traffic.lib line  52 | Success getting IpInfo for [REDACTED]
1520733615 ERROR django.request line 132 | Internal Server Error: /traffic
Traceback (most recent call last):
  File "/var/www/nstoler.com/.venv/lib/python3.5/site-packages/django/core/handlers/exception.py", line 42, in inner
    response = get_response(request)
  File "/var/www/nstoler.com/.venv/lib/python3.5/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/var/www/nstoler.com/.venv/lib/python3.5/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "./traffic/views.py", line 112, in monitor
    'timezone': set_timezone(request),  # Set and retrieve timezone.
  File "./traffic/ipinfo.py", line 179, in set_timezone
    tz = get_tz_abbrv(ipinfo[0].timezone)
  File "./traffic/ipinfo.py", line 212, in get_tz_abbrv
    return tz.tzname(datetime.now())
  File "/var/www/nstoler.com/.venv/lib/python3.5/site-packages/pytz/tzinfo.py", line 485, in tzname
    dt = self.localize(dt, is_dst)
  File "/var/www/nstoler.com/.venv/lib/python3.5/site-packages/pytz/tzinfo.py", line 327, in localize
    raise NonExistentTimeError(dt)
pytz.exceptions.NonExistentTimeError: 2018-03-11 02:00:15.682729

Happened on the afternoon before daylight savings in March (at 18:00:15 PST on March 10, 2018 (1520733615)).
Apparently it's trying to compute some time in the nonexistent hour between 2AM and 3AM?
The IP address is my Sunnyvale Comcast one.