diff --git a/homeassistant/components/nest/__init__.py b/homeassistant/components/nest/__init__.py
index bd74897371a..f9507b6ec7b 100644
--- a/homeassistant/components/nest/__init__.py
+++ b/homeassistant/components/nest/__init__.py
@@ -23,7 +23,7 @@ from homeassistant.helpers.entity import Entity
 from .const import DOMAIN
 from . import local_auth
 
-REQUIREMENTS = ['python-nest==4.0.2']
+REQUIREMENTS = ['python-nest==4.0.3']
 
 _CONFIGURING = {}
 _LOGGER = logging.getLogger(__name__)
@@ -86,6 +86,7 @@ async def async_nest_update_event_broker(hass, nest):
                 _LOGGER.debug("dispatching nest data update")
                 async_dispatcher_send(hass, SIGNAL_NEST_UPDATE)
             else:
+                _LOGGER.debug("stop listening nest.update_event")
                 return
 
 
diff --git a/homeassistant/components/sensor/nest.py b/homeassistant/components/sensor/nest.py
index bf1b3f65c4a..7afd3b762b3 100644
--- a/homeassistant/components/sensor/nest.py
+++ b/homeassistant/components/sensor/nest.py
@@ -133,7 +133,8 @@ class NestBasicSensor(NestSensorDevice):
         elif self.variable in PROTECT_SENSOR_TYPES \
                 and self.variable != 'color_status':
             # keep backward compatibility
-            self._state = getattr(self.device, self.variable).capitalize()
+            state = getattr(self.device, self.variable)
+            self._state = state.capitalize() if state is not None else None
         else:
             self._state = getattr(self.device, self.variable)
 
diff --git a/requirements_all.txt b/requirements_all.txt
index 74ff9286803..78fda284b17 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1059,7 +1059,7 @@ python-mpd2==1.0.0
 python-mystrom==0.4.4
 
 # homeassistant.components.nest
-python-nest==4.0.2
+python-nest==4.0.3
 
 # homeassistant.components.device_tracker.nmap_tracker
 python-nmap==0.6.1
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 6813378b12f..04952b75b81 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -156,7 +156,7 @@ pyqwikswitch==0.8
 python-forecastio==1.4.0
 
 # homeassistant.components.nest
-python-nest==4.0.2
+python-nest==4.0.3
 
 # homeassistant.components.sensor.whois
 pythonwhois==2.4.3