Unknow error (in logfile) during startup

Hi, I have the below error in my log file for a while but cannot find the root cause. Any ideas ?

18-07-27 03:24:31 INFO (SyncWorker_2) [hassio.docker.interface] Attach to image homeassistant/armhf-addon-mosquitto with version 2.0
18-07-27 03:24:31 INFO (SyncWorker_7) [hassio.docker.interface] Attach to image hassioaddons/appdaemon3-armhf with version v1.3.0
18-07-27 03:24:31 ERROR (MainThread) [asyncio] Task exception was never retrieved
future: <Task finished coro=<Addon.load() done, defined at /usr/local/lib/python3.7/site-packages/hassio/addons/addon.py:53> exception=TypeError("argument of type 'NoneType' is not iterable")>
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/hassio/addons/addon.py", line 56, in load
    await self.instance.attach()
  File "/usr/local/lib/python3.7/site-packages/hassio/utils/__init__.py", line 25, in wrap_api
    return await method(api, *args, **kwargs)
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/local/lib/python3.7/site-packages/hassio/docker/interface.py", line 148, in _attach
    "Attach to image %s with version %s", self.image, self.version)
  File "/usr/local/lib/python3.7/site-packages/hassio/docker/addon.py", line 47, in version
    return super().version
  File "/usr/local/lib/python3.7/site-packages/hassio/docker/interface.py", line 45, in version
    if self._meta and LABEL_VERSION in self._meta['Config']['Labels']:
TypeError: argument of type 'NoneType' is not iterable

I get this one too. What addons are you running?