Python GUI Crash on Progress bar

class MaruCrawler(QWidget):
    def __init__(self):
        super().__init__()
        self.dir_path = "./"
        self.driver = webdriver.Chrome('Chrome/chromedriver.exe')
        self.URL = None
        self.initUI()

    def initUI(self):

        self.setWindowTitle('MaruCrawler')

        self.url_input = QLineEdit(self)
        self.url_input.returnPressed.connect(self.inputChanged)
        self.url_input.resize(300,20)

        self.btn = QPushButton(self)
        self.btn.clicked.connect(self.inputChanged)
        self.btn.move(70,70)

        self.pbar = QProgressBar(self)
        self.pbar.resize(200,30)
        self.pbar.move(100,100)

        self.move(300, 300)
        self.resize(400, 200)
        self.show()

    def inputChanged(self):
        self.pbar.setMaximum(0)
        self.URL = self.url_input.text()
        self.btn.setEnabled(False)
        self.url_input.setEnabled(False)
        self.pbar.setMaximum(0)
        self.crw = ThreadCrawler(parent=self)
        self.crw.start()

        self.crw.finished.connect(self.crawl_finish)

    @pyqtSlot(int)
    def crawl_finish(self, value):
        print(value)
        if value == 1:
            QMessageBox.information(self, 'Message', 'Finish')
        elif value == 2:
            QMessageBox.information(self, 'Message', 'Error')
        self.btn.setEnabled(True)
        self.url_input.setEnabled(True)
        self.url_input.clear()
        self.pbar.reset()

i made image crawling GUI but the problem is that when i add

self.pbar.setMaximum(0)

in def inputChanged when loading crawling thread, the program crash with 0xC0000005 code

if i rip this code, code works well....