diff --git a/homeassistant/components/media_player/sonos.py b/homeassistant/components/media_player/sonos.py
index 9020fa41b4d..3deacd84e10 100644
--- a/homeassistant/components/media_player/sonos.py
+++ b/homeassistant/components/media_player/sonos.py
@@ -15,8 +15,6 @@ media_player:
 import logging
 import datetime
 
-REQUIREMENTS = ['SoCo==0.11.1']
-
 from homeassistant.components.media_player import (
     MediaPlayerDevice, SUPPORT_PAUSE, SUPPORT_SEEK, SUPPORT_VOLUME_SET,
     SUPPORT_VOLUME_MUTE, SUPPORT_PREVIOUS_TRACK, SUPPORT_NEXT_TRACK,
@@ -26,6 +24,9 @@ from homeassistant.helpers.event import track_utc_time_change
 from homeassistant.const import (
     STATE_IDLE, STATE_PLAYING, STATE_PAUSED, STATE_UNKNOWN)
 
+
+REQUIREMENTS = ['SoCo==0.11.1']
+
 _LOGGER = logging.getLogger(__name__)
 
 SUPPORT_SONOS = SUPPORT_PAUSE | SUPPORT_VOLUME_SET | SUPPORT_VOLUME_MUTE |\
@@ -35,9 +36,15 @@ SUPPORT_SONOS = SUPPORT_PAUSE | SUPPORT_VOLUME_SET | SUPPORT_VOLUME_MUTE |\
 # pylint: disable=unused-argument
 def setup_platform(hass, config, add_devices, discovery_info=None):
     """ Sets up the Sonos platform. """
-
     import soco
-    add_devices(SonosDevice(hass, p) for p in soco.discover())
+
+    players = soco.discover()
+    if not players:
+        _LOGGER.warning('No Sonos speakers found. Disabling: %s', __name__)
+        return False
+
+    add_devices(SonosDevice(hass, p) for p in players)
+    _LOGGER.info('Added %s Sonos speakers', len(players))
 
     return True
 
@@ -113,6 +120,13 @@ class SonosDevice(MediaPlayerDevice):
     def media_duration(self):
         """ Duration of current playing media in seconds. """
         dur = self._trackinfo.get('duration', '0:00')
+
+        # If the speaker is playing from the "line-in" source, getting
+        # track metadata can return NOT_IMPLEMENTED, which breaks the
+        # volume logic below
+        if dur == 'NOT_IMPLEMENTED':
+            return None
+
         return sum(60 ** x[0] * int(x[1]) for x in
                    enumerate(reversed(dur.split(':'))))