qwebenginewidgets module result in crash when restart the application

//mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QWebEngineView>
#include <QPushButton>
#include <QUrl>
#include <QCoreApplication>


MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->pushButton->setFixedSize(QSize(100,30));
    QWebEngineView* view = new QWebEngineView(this);
    ui->horizontalLayout->insertWidget(1,view);
    view->setUrl(QUrl("https://www.bing.com"));

    connect(ui->pushButton,&QPushButton::clicked,[]{
        QCoreApplication::exit(12345);
    });
}

MainWindow::~MainWindow()
{
    delete ui;
}

//main.cpp
#include "mainwindow.h"

#include <QApplication>
#include <QWebEngineView>
#include <QWebEngineProfile>
#include <QWebEngineSettings>
#include <QDebug>

int main(int argc, char *argv[])
{
    int ret = 0;
    do{
        QApplication a(argc, argv);    
        MainWindow w;
        w.show();
        ret = a.exec();
    } while(ret == 12345);
    return ret;

}

//mainwindow.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class&gt;MainWindow</class&gt;
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QHBoxLayout" name="horizontalLayout">
    <item>
     <widget class="QPushButton" name="pushButton">
      <property name="text">
       <string>PushButton</string>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>23</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>