# Buggy code
def __singleton_init__(
    self,
    opts,
    functions,
    returners=None,
    intervals=None,
    cleanup=None,
    proxy=None,
    standalone=False,
    utils=None,
    _subprocess_list=None,
):
    self.opts = opts
    self.proxy = proxy
    self.functions = functions
    self.utils = utils or salt.loader.utils(opts)
    self.standalone = standalone
    self.skip_function = None
    self.skip_during_range = None
    self.splay = None
    self.enabled = True
    if isinstance(intervals, dict):
        self.intervals = intervals
    else:
        self.intervals = {}
    if not self.standalone:
        if hasattr(returners, "__getitem__"):
            self.returners = returners
        else:
            self.returners = returners.loader.gen_functions()
    self.time_offset = self.functions.get("timezone.get_offset", lambda: "0000")()
    self.schedule_returner = self.option("schedule_returner")
    # Keep track of the lowest loop interval needed in this variable
    self.loop_interval = six.MAXSIZE
    if not self.standalone:
        clean_proc_dir(opts)
    if cleanup:
        for prefix in cleanup:
            self.delete_job_prefix(prefix)
    if _subprocess_list is None:
        self._subprocess_list = salt.utils.process.SubprocessList()
    else:
        self._subprocess_list = _subprocess_list


# Traceback (pytz.exceptions.UnknownTimeZoneError)
2020-09-02 11:10:37,702 [salt.minion      :1050][CRITICAL][972] Unexpected error while connecting to <master>
Traceback (most recent call last):
File "c:\salt\bin\lib\site-packages\salt\minion.py", line 1027, in _connect_minion
yield minion.connect_master(failed=failed)
File "c:\salt\bin\lib\site-packages\tornado\gen.py", line 1055, in run
value = future.result()
File "c:\salt\bin\lib\site-packages\tornado\concurrent.py", line 238, in result
raise_exc_info(self._exc_info)
File "<string>", line 4, in raise_exc_info
File "c:\salt\bin\lib\site-packages\tornado\gen.py", line 1063, in run
yielded = self.gen.throw(*exc_info)
File "c:\salt\bin\lib\site-packages\salt\minion.py", line 1226, in connect_master
yield self._post_master_init(master)
File "c:\salt\bin\lib\site-packages\tornado\gen.py", line 1055, in run
value = future.result()
File "c:\salt\bin\lib\site-packages\tornado\concurrent.py", line 238, in result
raise_exc_info(self._exc_info)
File "<string>", line 4, in raise_exc_info
File "c:\salt\bin\lib\site-packages\tornado\gen.py", line 1069, in run
yielded = self.gen.send(value)
File "c:\salt\bin\lib\site-packages\salt\minion.py", line 1273, in _post_master_init
cleanup=[master_event(type='alive')])
File "c:\salt\bin\lib\site-packages\salt\utils\schedule.py", line 105, in __new__
utils=utils)
File "c:\salt\bin\lib\site-packages\salt\utils\schedule.py", line 152, in __singleton_init__
self.time_offset = self.functions.get('timezone.get_offset', lambda: '0000')()
File "c:\salt\bin\lib\site-packages\salt\modules\win_timezone.py", line 241, in get_offset
tz_object = pytz.timezone(get_zone())
File "c:\salt\bin\lib\site-packages\pytz\__init__.py", line 181, in timezone
raise UnknownTimeZoneError(zone)
pytz.exceptions.UnknownTimeZoneError: 'Unknown'

# Fixed code
def __singleton_init__(
    self,
    opts,
    functions,
    returners=None,
    intervals=None,
    cleanup=None,
    proxy=None,
    standalone=False,
    utils=None,
    _subprocess_list=None,
):
    self.opts = opts
    self.proxy = proxy
    self.functions = functions
    self.utils = utils or salt.loader.utils(opts)
    self.standalone = standalone
    self.skip_function = None
    self.skip_during_range = None
    self.splay = None
    self.enabled = True
    if isinstance(intervals, dict):
        self.intervals = intervals
    else:
        self.intervals = {}
    if not self.standalone:
        if hasattr(returners, "__getitem__"):
            self.returners = returners
        else:
            self.returners = returners.loader.gen_functions()
    try:
        self.time_offset = self.functions.get("timezone.get_offset", lambda: "0000")()
    except Exception:  # pylint: disable=W0703
        # get_offset can fail, if that happens, default to 0000
        log.warning(
            "Unable to obtain correct timezone offset, defaulting to 0000",
            exc_info_on_loglevel=logging.DEBUG,
        )
        self.time_offset = "0000"

    self.schedule_returner = self.option("schedule_returner")
    # Keep track of the lowest loop interval needed in this variable
    self.loop_interval = six.MAXSIZE
    if not self.standalone:
        clean_proc_dir(opts)
    if cleanup:
        for prefix in cleanup:
            self.delete_job_prefix(prefix)
    if _subprocess_list is None:
        self._subprocess_list = salt.utils.process.SubprocessList()
    else:
        self._subprocess_list = _subprocess_list