[Python] Tkinter invokes wm command when window destroyed after CTkMessagebox used

My application uses CustomTkinter and reads data on start up:

import customtkinter as ctk
from CTkMessagebox import CTkMessagebox


class App(ctk.CTk):
def __init__(self) -> None:
super().__init__()
self.wnd_root = ctk.CTk()
self.after_idle(self.on_startup)

def on_startup(self) -> None:
# Load required data here, assume it fails
mbox = CTkMessagebox()
self.wait_window(mbox)
self.destroy()


if __name__ == '__main__':
app = App()
app.mainloop()


If this fails it outputs a message box and waits for it to close then destroys the window.

This throws a "TclError: can't invoke "wm" command: application has been destroyed" error:

invalid command name "2759755045376check_dpi_scaling"
while executing
"2759755045376check_dpi_scaling"
("after" script)
invalid command name "2759665803776update"
while executing
"2759665803776update"
("after" script)
Traceback (most recent call last):
File "C:\Users\danie\PycharmProjects\THCompetencyTracker\source\close_test.py", line 20, in <module>
app.mainloop()
File "C:\Users\danie\PycharmProjects\THCompetencyTracker\.venv\Lib\site-packages\customtkinter\windows\ctk_tk.py", line 157, in mainloop
self._windows_set_titlebar_color(self._get_appearance_mode())
File "C:\Users\danie\PycharmProjects\THCompetencyTracker\.venv\Lib\site-packages\customtkinter\windows\ctk_tk.py", line 319, in _windows_set_titlebar_color
self.state(self._state_before_windows_set_titlebar_color) # other states
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\danie\AppData\Local\Programs\Python\Python312\Lib\tkinter\__init__.py", line 2290, in wm_state
return self.tk.call('wm', 'state', self._w, newstate)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_tkinter.TclError: can't invoke "wm" command: application has been destroyed
can't invoke "winfo" command: application has been destroyed


Any help?

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