Android SQLite with multiple tables

public class DatabaseHandler extends SQLiteOpenHelper {

   //COLUMNS OF THE NEW USER TABLE
    public static final String TABLE_NEWUSER = "newUser";
    public static final String COLUMN_NEWUSER_ID = "id";
    public static final String COLUMN_NEWUSER_NAME = "name";
    public static final String COLUMN_NEW_USER_PASSWORD = "password";
    public static final String COLUMN_NEW_USER_AGE = "age";

    //COLUMNS OF THE BALANCE TABLE
    public static final String COLUMN_BALANCE_ID = "id";
    public static final String TABLE_BALANCE = "balanceOfUser";
    public static final String COLUMN_BALANCE_DOLLARBALANCE = "dollarBalance";
    public static final String COLUMN_BALANCE_RUBBALANCE = "rubBalance";
    public static final String COLUMN_BALANCE_NEW_USER_ID = "newUserId";

    private static final String DATABASE_NAME = "webStore";
    private static final int DATABASE_VERSION = 1;

    private static final String SQL_CREATE_NEWUSER = "CREATE TABLE " + TABLE_NEWUSER + "("
            + COLUMN_NEWUSER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
            + COLUMN_NEWUSER_NAME + " TEXT NOT NULL, "
            + COLUMN_NEW_USER_PASSWORD + " TEXT NOT NULL, "
            + COLUMN_NEW_USER_AGE + " INTEGER NOT NULL"
            + ");";
    private static final String SQL_CREATE_BALANCE = "CREATE TABLE" + TABLE_BALANCE + "("
            + COLUMN_BALANCE_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
            + COLUMN_BALANCE_DOLLARBALANCE + " INTEGER NOT NULL"
            + COLUMN_BALANCE_RUBBALANCE + " INTEGER NOT NULL"
            + COLUMN_BALANCE_NEW_USER_ID + " INTEGER NOT NULL"
            + ");";
    public DatabaseHandler(Context context){
        super(context,DATABASE_NAME,null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(SQL_CREATE_BALANCE);
        db.execSQL(SQL_CREATE_NEWUSER);
        onCreate(db);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_BALANCE);
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_NEWUSER);
    }
  public DatabaseHandler(Context context, String name, SQLiteDatabase.CursorFactory factory,int version){
      super(context,DATABASE_NAME,factory,DATABASE_VERSION);
  }

}

public void CreateUser(View view) {
    etName = (EditText)findViewById(R.id.etName);
    etPassword = (EditText)findViewById(R.id.etPassword);
    etAge = (EditText)findViewById(R.id.etAge);
    String name = String.valueOf(etName.getText());
    String password = String.valueOf(etPassword.getText());
    int age = Integer.parseInt(String.valueOf(etAge.getText()));
    //write to database of user from our edit texts
    DatabaseHandler databaseHandler = new DatabaseHandler(this);
    Log.d("Insert: ", "Inserting ..");
    NewUserDAO dbForUser = new NewUserDAO(this);
    dbForUser.createNewUser(name,password,age);
}

I have 2 tables and in table balance i have key of user. When i create new user (createUser method) i have exception:

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'long android.database.sqlite.SQLiteDatabase.insert(java.lang.String, java.lang.String, android.content.ContentValues)' on a null object reference.

Where is the problem? thanks