Fixed error on exit

libremsonic/app.py

@@ -347,10 +347,10 @@ class LibremsonicApp(Gtk.Application):
             return True
 
     def on_app_shutdown(self, app):
-        CacheManager.should_exit = True
         self.player.pause()
         self.chromecast_player.shutdown()
         self.mpv_player.shutdown()
+        CacheManager.should_exit = True
 
         self.state.save()
         self.save_play_queue()

libremsonic/ui/common/players.py

@@ -372,4 +372,5 @@ class ChromecastPlayer(Player):
             return 100
 
     def shutdown(self):
-        self.chromecast.disconnect(blocking=True)
+        if self.chromecast:
+            self.chromecast.disconnect(blocking=True)