Exception async_track_utc_time_change

i get this error over and over every second. Whats going wrong?

Sep 18 22:20:30 hassbian hass[3676]: 2017-09-18 22:20:30 ERROR (MainThread) [homeassistant.core] Error doing job: Exception in callback async_track_utc_time_change..pattern_time_change_listener(<Event time_c…619338+02:00>) at /srv/homeassistant/lib/python3.4/site-packages/homeassistant/helpers/event.py:272
Sep 18 22:20:30 hassbian hass[3676]: Traceback (most recent call last):
Sep 18 22:20:30 hassbian hass[3676]: File “/usr/lib/python3.4/asyncio/events.py”, line 120, in _run
Sep 18 22:20:30 hassbian hass[3676]: self._callback(*self._args)
Sep 18 22:20:30 hassbian hass[3676]: File “/srv/homeassistant/lib/python3.4/site-packages/homeassistant/helpers/event.py”, line 286, in pattern_time_change_listener
Sep 18 22:20:30 hassbian hass[3676]: mat(now.minute, minute) and
Sep 18 22:20:30 hassbian hass[3676]: File “/srv/homeassistant/lib/python3.4/site-packages/homeassistant/helpers/event.py”, line 336, in _matcher
Sep 18 22:20:30 hassbian hass[3676]: return subject % float(pattern.lstrip(‘/’)) == 0
Sep 18 22:20:30 hassbian hass[3676]: ZeroDivisionError: float modulo