Error in anroid- SQLITEOPENHELPER

So guys i have got problem in my DbHelper class::

enter public class DbHelper extends SQLiteOpenHelper {

public static final int DATABASE_VERSION =1;
public static final String DATABASE_NAME="skojarzenia";
public static final String DATABASE_TABLE="znane_wyrazy";


public DbHelper(Context context) {
    super(context, DATABASE_NAME,null,DATABASE_VERSION);
    SQLiteDatabase db = getWritableDatabase();
    db.close();
}

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL("CREATE TABLE "+DATABASE_TABLE+" (ENGLISH VARCHAR,POLISH VARCHAR)");
    db.close();
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("DROP TABLE IF EXISTS"+DATABASE_TABLE);
    onCreate(db);
    db.close();
}

}

my class when i create object of this class:

public class Znasz extends AppCompatActivity {
DbHelper myDb;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_znasz);
    myDb = new DbHelper(this);

}

And when i create consturcotr "new Db..." then app "unexpected" closes

What is is wrong?? I supose something with query??

Please help :) Thanks