Android alkalmazás nem indul... Mi lehet a probléma?

Android Studio-ban kell csinálnom egy egyszerű alkalmazást, amihez kell egy adatbázis (SQLite). De ezzel a hibával leáll az alkalmazás miután elindítom.

java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.

DAO Class:

@Override

public List<WishItem> getAllWishItems() {

SQLiteDatabase db = helper.getReadableDatabase();

Cursor cursor = db.rawQuery("SELECT * FROM wishitem", null);

List<WishItem> items = new ArrayList<>();

cursor.moveToFirst();

while (!cursor.isAfterLast()) {

int id = cursor.getInt(cursor.getColumnIndex("_id"));

String name = cursor.getString(cursor.getColumnIndex("name"));

int year = cursor.getInt(cursor.getColumnIndex("year"));

int month = cursor.getInt(cursor.getColumnIndex("month"));

int day = cursor.getInt(cursor.getColumnIndex("day"));

int importance = cursor.getInt(cursor.getColumnIndex("importance"));

WishItem wi = new WishItem(id, name, year, month, day, importance);

items.add(wi);

cursor.moveToNext();

}

cursor.close();

db.close();

return items;

}

SQLiteOpenHelper Class:

@Override

public void onCreate(SQLiteDatabase db) {

db.execSQL("CREATE TABLE wishitem (_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, year INTEGER, month INTEGER, day INTEGER, importance INTEGER)");

}

A hibát a DAO osztályban az "int year = cursor.getInt(cursor.getColumnIndex("year"));" dobja...