Persistent error message since ~0.18.x update

Ever since updating to ~0.18.x a few weeks ago, I keep getting this error message in the logs. Prior to 0.18 I had no regular error messages appearing. Any idea what could be causing it, or where I should start looking?

16-04-27 00:24:55 homeassistant.bootstrap: Error during setup of component device_tracker
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/homeassistant/", line 158, in _setup_component
    if not component.setup(hass, config):
  File "/usr/local/lib/python3.4/dist-packages/homeassistant/components/device_tracker/", line 100, in setup
    seconds=util.convert(conf.get(CONF_CONSIDER_HOME), int,
AttributeError: 'list' object has no attribute 'get'

For the record, I have not added any device_tracker entries to the config.yaml file. Also, it could just be coincidence, but I see an update to a similar Github issue ~ 2 weeks ago, and was wondering if they are related: