tkinter RuntimeError when "Delete files" option is checked

[imagejan]

Exception ignored in: <function Variable.__del__ at 0x0000026FDE9BD080>
Traceback (most recent call last):
  File "C:\Utilities\faim-robocopy\.pixi\envs\default\Lib\tkinter\__init__.py", line 410, in __del__
    if self._tk.getboolean(self._tk.call("info", "exists", self._name)):
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: main thread is not in main loop
Tcl_AsyncDelete: async handler deleted by the wrong thread