Crash on Landscape mode

[sachincool]

Expected behavior

Open the app and open the stock features / menu provided to see push notifications and the latest real-time updates.

Actual behavior

When I open the app and open the stock features / menu provided to see push notifications and the latest real-time updates with landscape mode, the app stops automatically. All stock features if I run in landscape mode cause the app to stop.

• Browser : Redmi Note 5A
• System Operating : 7.1.0 Nougat
• App Version : 2.2.0

How to reproduce

You can get the LightStreamer Stock-List Demo FCM app on the Play Store. When you successfully install the application, you just open and run the application. You can click / open all the stock features that are provided. When you have entered the feature, you can activate landscape mode / screen rotation mode. when you play the phone when the feature is run, the application will stop automatically.

Recording Of The Bug

https://www.youtube.com/watch?v=kej6QQNn2bo

Along with Log-cat ``` 05-09 13:25:05.161 32568 32568 E AndroidRuntime: FATAL EXCEPTION: main 05-09 13:25:05.161 32568 32568 E AndroidRuntime: Process: com.lightstreamer.demo.android.fcm, PID: 32568 05-09 13:25:05.161 32568 32568 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lightstreamer.demo.android.fcm/com.lightstreamer.demo.android.fcm.StockListDemo}: java.lang.IllegalStateException: No MPN device registered 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2743) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2808) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4665) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.app.ActivityThread.-wrap19(ActivityThread.java) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1550) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:110) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.os.Looper.loop(Looper.java:203) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6297) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1084) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:945) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: Caused by: java.lang.IllegalStateException: No MPN device registered 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at com.lightstreamer.client.LightstreamerClient.getMpnSubscriptions(LightstreamerClient.java:856) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at com.lightstreamer.demo.android.fcm.LsClient.getMpnSubscriptions(LsClient.java:117) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at com.lightstreamer.demo.android.fcm.DetailsFragment$ItemSubscription.(DetailsFragment.java:301) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at com.lightstreamer.demo.android.fcm.DetailsFragment.updateStocksView(DetailsFragment.java:197) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at com.lightstreamer.demo.android.fcm.DetailsFragment.onStart(DetailsFragment.java:166) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.support.v4.app.Fragment.performStart(Fragment.java:2100) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1142) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1286) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1268) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.support.v4.app.FragmentManagerImpl.dispatchStart(FragmentManager.java:2148) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.support.v4.app.FragmentController.dispatchStart(FragmentController.java:212) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:625) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1248) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.app.Activity.performStart(Activity.java:6702) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2706) 05-09 13:25:05.161 32568 32568 E AndroidRuntime: ... 10 more ```