How do I keep a TKinter window open after playing audio using pydub?

I'm building a basic text to audio app using python.When I play an audio file after taking an input from a user and clicking a button, the window closes after the audio file is played.

app = CTk()
app.title("Text to Morse Code")
app.geometry("600x400")


def gui_handler():
    def input_to_morse():
        morse_code = text_to_morse(entry.get())
        morse_audio = morse_to_audio(morse_code)

        threading.Thread(target=play, args=(morse_audio,)).start()

        print("Hello")

    gen_morse_button = CTkButton(app, text="Generate Morse Code", command=input_to_morse)
    entry = CTkEntry(app, placeholder_text="Enter text to be converted")

    app.grid_columnconfigure(0, weight=1)
    entry.grid(row=0, column=0, padx=40, pady=20, sticky="ew")
    gen_morse_button.grid(row=1, column=0, padx=40, pady=20, sticky="ew")




gui_handler()
app.mainloop()

This is the exit code for when the window closes.

Process finished with exit code 139 (interrupted by signal 11:SIGSEGV)

I looked this up and it says some sort of segmentation error but I'm not sure how to fix it. I've tried using simple audio where I export the file from pydub and played it using simple audio but it's the same issue.

Edit : This is the morse_to_audio function

# Audio objects
dash = AudioSegment.from_file("./audio/beep.wav", format="wav")[:200]
dot = dash[:50]
short_gap = AudioSegment.silent(duration=100)
medium_gap = AudioSegment.silent(duration=200)
long_gap = AudioSegment.silent(duration=500)

def morse_to_audio(morse_code: list):
    """
    Converts a given list of morse code values and returns an audio file.
    :param morse_code: List of Morse code values depicted in "." "-"
    :return: Audio of Morse code being played.
    """
    morse_audio = AudioSegment.empty()
    for i, letter in enumerate(morse_code):
        if letter == " ":
            morse_audio += long_gap
        else:
            for j, symbol in enumerate(letter):
                if symbol == ".":
                    morse_audio += dot
                elif symbol == "-":
                    morse_audio += dash
                # if the symbol isn't the last symbol in a letter add a short gap
                if j < len(letter) - 1:
                    morse_audio += short_gap
            # if there is a next letter, and it isn't a space add a medium gap
            if i + 1 < len(morse_code) and morse_code[i + 1] != " ":
                morse_audio += medium_gap
    return morse_audio