使用64位Python时tkinterhtml.HtmlFrame.set_content（）崩溃

Question

我在Windows机器上同时安装了32位和64位Python。当我以32位元运行以下程序时，它可以正常工作，但以64位元运行时，当您单击按钮打开HTML页面时，它以Process finished with exit code -1073741819 (0xC0000005)崩溃。注释掉标记为# this line的行使其有效，尽管显然它不显示HTML。我该如何解决？

import tkinter
from tkinter import ttk

import tkinterhtml


class Gui:
    root = None

    def open_html_page(self):
        local_root = tkinter.Toplevel(self.root)
        local_root.transient(self.root)
        local_root.grab_set()

        big_frame = ttk.Frame(local_root)
        big_frame.pack(fill='both', expand=True)

        html = "<b>This is an <i>HTML</i> page</b>"

        html_frame = tkinterhtml.HtmlFrame(local_root)
        html_frame.pack()
        print(html)
        html_frame.set_content(html) # this line

        local_root.mainloop()

    def launch_gui(self):
        self.root = tkinter.Tk()
        big_frame = ttk.Frame(self.root)
        big_frame.pack(fill='both', expand=True)

        open_html_button = ttk.Button(big_frame, text="Open HTML page", command=self.open_html_page)
        open_html_button.pack()

        self.root.mainloop()


def main():
    Gui().launch_gui()


if __name__ == '__main__':
    main()