TypeError - can't compare offset-naive and offset-aware datetimes

[stilet]

TypeError at /swingtime/
can't compare offset-naive and offset-aware datetimes

when adding to an event Occurrence

swingtime/utils.py in create_timeslot_table
if item.end_time <= dtstart:

css_class_cycles	<function css_class_cycler at 0x7f68f68dbae8>
dt	datetime.datetime(2019, 10, 29, 16, 42, 2, 462483)
dtend	datetime.datetime(2019, 10, 29, 20, 30)
dtstart	datetime.datetime(2019, 10, 29, 14, 0)
end_time_delta	datetime.timedelta(0, 23400)
item	<Occurrence: SZV-M: 2019-10-29T13:41:52+00:00>
items	<QuerySet [<Occurrence: SZV-M: 2019-10-29T13:41:52+00:00>]>
min_columns	4
n	datetime.datetime(2019, 10, 29, 20, 45)
proxy_class	<class 'swingtime.utils.DefaultOccurrenceProxy'>
start_time	datetime.time(14, 0)
time_delta	datetime.timedelta(0, 900)

url - calendar/2019/10/29/ day view

[stilet]

USE_TZ = False in settings removes the error