Android local calender id

I'm adding, updating, deleting events using local calendar. I'm using this code to get local calendar id:

private static long getCalendarId(Context context) {
    String[] projection = new String[]{CalendarContract.Calendars._ID};
    String selection = CalendarContract.Calendars.ACCOUNT_TYPE + " = ? ";
    String[] selArgs = new String[]{CalendarContract.ACCOUNT_TYPE_LOCAL};

    Cursor cursor = context.getContentResolver().
            query(CalendarContract.Calendars.CONTENT_URI, projection,
                    selection, selArgs, null);

    if (cursor.moveToFirst()) {
        return cursor.getLong(0);
    }

    return -1;
}

Is there a case that -1 is returned? like not having local calendar on some devices/OSs, or being deleted by the user, or some other reason? If this is not safe please provide an alternative. Thanks.