Multiprocessing problems with flet build windows executable #3547

import queue
import random
import time
from multiprocessing import Queue, Event, Process, freeze_support

import flet as ft

STOP_EVENT = Event()
RESULT_QUEUE = Queue()


def gen_rand(q: Queue, stop_event: Event):
    stop_gen = False
    while not stop_gen:
        if stop_event.is_set():
            stop_gen = True
        random_number = random.randint(0, 100)
        q.put(random_number)
        time.sleep(1)


def main(page: ft.Page):
    def on_window_event(e):
        if e.data == 'close':
            STOP_EVENT.set()
            while not RESULT_QUEUE.empty():
                RESULT_QUEUE.get()
            RESULT_QUEUE.close()
            process_gen.join(5)
            page.window.destroy()

    page.window.prevent_close = True
    page.window.on_event = on_window_event

    process_gen = Process(target=gen_rand, args=(RESULT_QUEUE, STOP_EVENT))
    process_gen.start()

    while not STOP_EVENT.is_set():
        try:
            rand_number = RESULT_QUEUE.get(timeout=5)
            page.add(ft.Text(f'Generated Number: {rand_number}'))
        except queue.Empty:
            pass


if __name__ == '__main__':
    freeze_support()
    ft.app(main)