notifications: ^2.0.1 - Android APP Keep Stopping in Samsung Device

### notifications: ^2.0.1

### Device / Emulator and OS
- Device: [e.g. Samsung ]
- OS: [e.g. Android 12]

### Describe the bug
notifications: ^2.0.1 used to fetch Notifications but when app app background sometimes app keep stopping particularly in dial pad app is crashed.

```
Shutting down VM
E/AndroidRuntime( 9928): FATAL EXCEPTION: main
E/AndroidRuntime( 9928): Process: com.example.testapp, PID: 9928
E/AndroidRuntime( 9928): java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.String java.lang.CharSequence.toString()' on a null object reference
E/AndroidRuntime( 9928): at dk.cachet.notifications.NotificationListener.onNotificationPosted(NotificationListener.java:41)
E/AndroidRuntime( 9928): at android.service.notification.NotificationListenerService.onNotificationPosted(NotificationListenerService.java:444)
E/AndroidRuntime( 9928): at android.service.notification.NotificationListenerService$MyHandler.handleMessage(NotificationListenerService.java:2337)
E/AndroidRuntime( 9928): at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime( 9928): at android.os.Looper.loopOnce(Looper.java:226)
E/AndroidRuntime( 9928): at android.os.Looper.loop(Looper.java:313)
E/AndroidRuntime( 9928): at android.app.ActivityThread.main(ActivityThread.java:8751)
E/AndroidRuntime( 9928): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 9928): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
E/AndroidRuntime( 9928): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)
I/Process ( 9928): Sending signal. PID: 9928 SIG: 9
```

### Screenshot
ts

Start at NotificationListener.java:41, where the stack trace reports the NullPointerException, and review how Android notifications are handled through NotificationListenerService. Reproduce the crash when the app is in the background, particularly around the dial pad scenario. Done means the app remains running when the reported notification event occurs.

Written by the indexing model from the issue text.