TypeError: 'NoneType' object is not subscriptable

[syafiq14]

I'm trying to check whether the user entered the correct path or not.
when the output appears it doesn't give any error but when i close the output it gets an error :

Traceback (most recent call last):
  File "voice_translate.py", line 115, in <module>
    main()
  File "voice_translate.py", line 88, in main
    if check_file(values["Path"]):
TypeError: 'NoneType' object is not subscriptable

I think it's wrong the

os.path.isfile()

method
but when I try to catch the error it still returns the same error

Here's the code to try to catch the error :

def check_file(path):
    try:
        os.path.isfile(path)
        return True
    except TypeError:
        return False

and this is the main code :

import os
import pyttsx3
import requests
import googletrans
import PySimpleGUI as sg
import speech_recognition as sr


def audio_layout():
    """ return audio layout """
    layout = [
        [sg.In(key="Path", size=(39, 0))],
        [
            sg.FileBrowse("Browse", size=(10, 0), target="Path"),
            sg.Button("Text", size=(10, 0)),
            sg.Button("Voice", size=(10, 0)),
        ],
    ]

    return sg.Window("Voice Translate", layout, finalize=True)


def result_layout():
    """ return result layout """
    layout = [[sg.Output(size=(60, 20))]]

    return sg.Window("Voice Translate", layout, finalize=True)


def language_translate(text, lang="id"):
    """ returns the text after it is translated """
    translator = googletrans.Translator()
    lang_convert = translator.translate(text, dest=lang)

    return lang_convert.text


def audio_to_text(audio):
    """ convert audio to text """
    recognizer = sr.Recognizer()
    sound = sr.AudioFile(audio)
    with sound as source:
        audio = recognizer.record(source)

    return recognizer.recognize_google(audio)


def text_to_audio(text):
    """ convert text into voice """
    engine = pyttsx3.init()
    engine.say(text)
    engine.runAndWait()
    engine.stop()


def check_internet():
    """ return true if internet is connect  """
    # google url only to test whether the user is connected to the internet
    url = "https://www.google.com/"
    timeout = 3
    try:
        requests.head(url, timeout=timeout)
        return True
    except requests.ConnectionError:
        sg.popup("Lost Connection!")
        return False


def check_file(path):
    try:
        os.path.isfile(path)
        return True
    except TypeError:
        return False


# main program
def main():
    audio_window, result_window, allowed = audio_layout(), None, False
    while check_internet():
        # read/get all event in all window
        window, event, values = sg.read_all_windows()
        # audio layout/window event handling
        if window == audio_window and event in (sg.WIN_CLOSED, "Exit"):
            break

        # bug! "TypeError: 'NoneType' object is not subscriptable"
        if check_file(values["Path"]):
            convert_to_text = audio_to_text(values["Path"])
            text_translate = language_translate(convert_to_text)
            allowed = True

        # user get the translate result of their voice
        if event == "Text" and allowed:
            result_window = result_layout()
            # show the output on output widget
            print(text_translate)

        if event == "Voice" and allowed:
            text_to_audio(text_translate)

        # result layout/window event handling
        if window == result_window and event in (sg.WIN_CLOSED, "Exit"):
            result_window.close()
            result_window = None
            allowed = False


    audio_window.close()
    if result_window is not None:
        result_window.close()


if __name__ == "__main__":
    main()

I know I can put the try and except statements above if or even replace them but I think it becomes unclean code and might make my code dirty