Cannot run application: xcb error

[tux-mania]

Hello!

I am trying to create a GUI application with customtkinter but I am facing an issue with just a little bit of code.
My code:

import customtkinter

# Set default application appearance
customtkinter.set_appearance_mode('dark')
customtkinter.set_default_color_theme('blue')

# Initialize main Window
window = customtkinter.CTk()
window.title('Application')
window.geometry('800x600')

cancel_button = customtkinter.CTkButton(master=window, text='Cancel')
copy_button = customtkinter.CTkButton(master=window, text='Copy')

cancel_button.pack()
copy_button.pack()

window.mainloop()

When starting the app with python gui.py, I get the following error:

[xcb] Unknown sequence number while appending request
[xcb] You called XInitThreads, this is not your fault
[xcb] Aborting, sorry about that.
python: xcb_io.c:157: append_pending_request: Assertion `!xcb_xlib_unknown_seq_number' failed.

If I remove the buttons, the application launches without issue.

• My system: Void Linux
• Python version: 3.12.5
• customtkinter version: v5.2.2

Thanks for your help!