diff --git a/homeassistant/components/media_player/plex.py b/homeassistant/components/media_player/plex.py
index 76278722291..5aaee6a341e 100644
--- a/homeassistant/components/media_player/plex.py
+++ b/homeassistant/components/media_player/plex.py
@@ -200,6 +200,7 @@ class PlexClient(MediaPlayerDevice):
         self.update_devices = update_devices
         self.update_sessions = update_sessions
         self.set_device(device)
+        self._season = None
 
     def set_device(self, device):
         """Set the device property."""
@@ -240,9 +241,15 @@ class PlexClient(MediaPlayerDevice):
 
     def update(self):
         """Get the latest details."""
+        from plexapi.video import Show
+
         self.update_devices(no_throttle=True)
         self.update_sessions(no_throttle=True)
 
+        if isinstance(self.session, Show):
+            self._season = self._convert_na_to_none(
+                self.session.seasons()[0].index)
+
     # pylint: disable=no-self-use, singleton-comparison
     def _convert_na_to_none(self, value):
         """Convert PlexAPI _NA() instances to None."""
@@ -310,9 +317,7 @@ class PlexClient(MediaPlayerDevice):
     @property
     def media_season(self):
         """Season of curent playing media (TV Show only)."""
-        from plexapi.video import Show
-        if isinstance(self.session, Show):
-            return self._convert_na_to_none(self.session.seasons()[0].index)
+        return self._season
 
     @property
     def media_series_title(self):