请问pyqt5作为主程序调用的子程序运行导致程序崩溃怎么办？

这是pyqt5主程序：

from PyQt5 import QtCore, QtGui, QtWidgets, uic
from PyQt5.Qt import (QApplication, QWidget, QPushButton,
                      QThread)
import buytest
import sys

class BT(QThread):
    def __init__(self):
        super().__init__()
        
    def run(self):
        buytest.ALL()

  
class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(873, 565)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.textBrowser = QtWidgets.QTextBrowser(self.centralwidget)
        self.textBrowser.setGeometry(QtCore.QRect(550, 10, 301, 351))
        self.textBrowser.setObjectName("textBrowser")
        self.dateTimeEdit = QtWidgets.QDateTimeEdit(self.centralwidget)
        self.dateTimeEdit.setGeometry(QtCore.QRect(10, 370, 521, 111))
        font = QtGui.QFont()
        font.setFamily("Old English Text MT")
        font.setPointSize(20)
        font.setBold(True)
        font.setWeight(75)
        font.setStyleStrategy(QtGui.QFont.PreferAntialias)
        self.dateTimeEdit.setFont(font)
        self.dateTimeEdit.setObjectName("dateTimeEdit")
        self.dateTimeEdit.dateTimeChanged.connect(self.onDateTimeChanged)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(50, 132, 261, 131))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
    def onDateTimeChanged(self,datetime):
        dt = datetime.toString("yyyy-MM-dd HH:mm:ss")
        time = datetime
        choose = int(2)
    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.dateTimeEdit.setDisplayFormat(_translate("MainWindow", "yyyy-MM-dd HH:mm:ss"))
        self.pushButton.setText(_translate("MainWindow", "淘宝"))
        self.pushButton.clicked.connect(self.OpenClick)
    def OpenClick(self):
        self.BT1 = BT()
        self.BT1.start()
if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

这是调用的子程序：

from selenium import webdriver
import datetime
import time
  
def ALL():
  def login():
    browser.get("https://www.taobao.com")
    #browser.get("www.masadora.jp")
    time.sleep(3)
    if browser.find_element_by_link_text("亲，请登录"):
      browser.find_element_by_link_text("亲，请登录").click()
      #browser.find_element_by_link_text("登录/注册").click()
      print("请在20秒内完成扫码")
      time.sleep(20)
      #browser.get("https://detail.tmall.com/item.htm?spm=a220o.1000855.1998025129.2.6c5557e9lJEzng&id=614513080829&scm=1007.12144.95220.23864_0_0&pvid=333fe54c-38a6-45f0-9c1b-b34df87a37a4&utparam=%7B%22x_hestia_source%22:%2223864%22,%22x_object_type%22:%22item%22,%22x_hestia_subsource%22:%22default%22,%22x_mt%22:5,%22x_src%22:%2223864%22,%22x_pos%22:2,%22wh_pid%22:-1,%22x_pvid%22:%22333fe54c-38a6-45f0-9c1b-b34df87a37a4%22,%22scm%22:%221007.12144.95220.23864_0_0%22,%22x_object_id%22:614513080829%7D&skuId=4501393646670")
      #browser.find_element_by_link_text("请登录").click()
      browser.get("https://cart.taobao.com/cart.htm")
    time.sleep(3)
    
    now = datetime.datetime.now()
    print('login success:', now.strftime('%Y-%m-%d %H:%M:%S'))
    
    
  def buy(times):
    while True:
      now = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f')
      if now > times:
        while True:
          try:
            if browser.find_element_by_link_text("结 算"):
              browser.find_element_by_link_text("结 算").click()
              print("结算成功")
              break
          except:
            pass
        while True:
          try:
            if browser.find_element_by_link_text('提交订单'):
              browser.find_element_by_link_text('提交订单').click()
              now1 = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f')
              print("抢购成功时间：%s" % now1)
          except:
            print("再次尝试提交订单")
        time.sleep(0.01)
  browser =webdriver.Chrome()
  browser.maximize_window()
  login()
  buy(times)

子程序单独作为主程序运行可以使用，但是作为被调用的子程序运行到这一步之后就会崩溃

now = datetime.datetime.now()
print('login success:', now.strftime('%Y-%m-%d %H:%M:%S'))

放到线程里去处理。

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