Emulator crashes and I can't fetch data

I have created a login app that once the login is successful the user is directed to a new activity. I have used a bundle to store the username to a string in the new activity, Then I went to my login adapter class and created a function that gets a string and returns a database query. But when I call the function in my new activity the emulator crashes!

Here is the code of the bundle:

String userName=editTextUserName.getText().toString();
        String password=editTextPassword.getText().toString();
        Bundle bundle = new Bundle();
        bundle.putString("username", userName);

Here I pass what i stored in the bundle to a string:

Bundle bundle = getIntent().getExtras();
String username = bundle.getString("username");

Here is the function in the LoginDataBaseAdapter class:

public Cursor FetchRow (String username){
return db.query("LOGIN",null,"USERNAME='"+username,null,null,null,null);

}

And finally here I call the function in the new activity and pass the string declared earlier:

loginDataBaseAdapter.FetchRow(username);

Why does the emulator crash and doesn't display the data? All it says is "Unfortunately Login_Final (name of the app) has crashed!

This is the error log:

Caused by: java.lang.NullPointerException
    at com.example.michalis.login_final.Login_home.onCreate(Login_home.java:32)
    at android.app.Activity.performCreate(Activity.java:5008)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)

— modified on Mar 22, 2015, 5:08:21 PM