title: Process: com.android.text, PID: 26427 java.lang.NullPointerException
body: <pre><code>2020-03-23 13:16:34.533 26427-26427/com.android.text E/AndroidRuntime: FATAL EXCEPTION: main
      Process: com.android.text, PID: 26427
      java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
          at com.android.text.MainActivity$1.onDataChange(MainActivity.java:54)
          at com.google.firebase.database.core.ValueEventRegistration.fireEvent(com.google.firebase:firebase-database@@19.2.1:75)
          at com.google.firebase.database.core.view.DataEvent.fire(com.google.firebase:firebase-database@@19.2.1:63)
          at com.google.firebase.database.core.view.EventRaiser$1.run(com.google.firebase:firebase-database@@19.2.1:55)
          at android.os.Handler.handleCallback(Handler.java:790)
          at android.os.Handler.dispatchMessage(Handler.java:99)
          at android.os.Looper.loop(Looper.java:166)
          at android.app.ActivityThread.main(ActivityThread.java:6518)
          at java.lang.reflect.Method.invoke(Native Method)
          at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
  </code></pre>