[PyQt] PyQt5 window closing when trying to display a graph

[bianca]

I am developing a GUI Application using PyQt5.

There is a tab with charts and the idea is when clicking a button, it displays a chart.

The following code works just fine:

from PyQt5 import QtCore, QtWidgets, QtWebEngineWidgets
import plotly.graph_objects as go
import pandas as pd

class CandlestickTab(QtWidgets.QWidget):
           def __init__(self, parent=None):
        super().__init__(parent)
        self.button = QtWidgets.QPushButton('Plot', self)
        self.browser = QtWebEngineWidgets.QWebEngineView(self)

        vlayout = QtWidgets.QVBoxLayout(self)
        vlayout.addWidget(self.button, alignment=QtCore.Qt.AlignHCenter)
        vlayout.addWidget(self.browser)

        self.button.clicked.connect(self.show_graph)
        self.resize(1000,800)

    def show_graph(self):
        df = px.data.tips()
        fig = px.box(df, x="day", y="total_bill", color="smoker")
        fig.update_traces(quartilemethod="exclusive") # or "inclusive", or "linear" by default
        self.browser.setHtml(fig.to_html(include_plotlyjs='cdn'))

I have a csv file with data about crypto such as timestamp, open, high, low, close, volume and I wanna display a CandleStick.
I modified the code keeping same structure as the one above and everytime I click the button, my application is closing and I receive this error: Process finished with exit code -1073740791 (0xC0000409)

from PyQt5 import QtCore, QtWidgets, QtWebEngineWidgets
import plotly.graph_objects as go
import pandas as pd

class CandlestickTab(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.button = QtWidgets.QPushButton('Show Candlestick Chart', self)
        self.browser = QtWebEngineWidgets.QWebEngineView(self)

        vlayout = QtWidgets.QVBoxLayout(self)
        vlayout.addWidget(self.button, alignment=QtCore.Qt.AlignHCenter)
        vlayout.addWidget(self.browser)

        self.button.clicked.connect(self.show_candlestick_chart)
        self.resize(1000, 800)

    def show_candlestick_chart(self):
        df = pd.read_csv('crypto.csv')
        if not df.empty:
            fig = go.Figure(data=[go.Candlestick(x=df['timestamp'],
                                                  open=df['open'],
                                                  high=df['high'],
                                                  low=df['low'],
                                                  close=df['close'])])
            self.browser.setHtml(fig.to_html(include_plotlyjs='cdn'))
        else:
            self.browser.setHtml("<p>No data available for plotting.</p>")

This is the main:

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QTabWidget
from home import HomeTab
from candlestick import CandlestickTab
from analiza_tehnica import AnalizaTehnicaTab
from sentiment_analysis import SentimentAnalysisTab
from alpha_get_data import AlphaGetData
# from news import NewsTab


class MainApp(QMainWindow):
    def __init__(self):
        super().__init__()

        self.init_ui()

    def init_ui(self):
        self.setWindowTitle('Aplicația Mea cu Tab-uri')
        self.setGeometry(100, 100, 800, 600)
        tabs = QTabWidget()

        tabs.addTab(HomeTab(),"Home")

        tabs.addTab(AnalizaTehnicaTab(), "Analiza Tehnica")
        tabs.addTab(CandlestickTab(),"CandleStick")
        tabs.addTab(SentimentAnalysisTab(), "Sentiment Analysis")

        self.setCentralWidget(tabs)




if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainApp()
    window.show()
    sys.exit(app.exec_())
    app.setQuitOnLastWindowClosed(False)

Can someone help me with this, please?