Regression: appending strings to QList<QString> crashes application

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QList<QString> strings;
    strings.append("first");
}
MainWindow::~MainWindow()
{
    delete ui;
}