App crashes on NixOS

[CakeMask]

Run on a fresh install in hpyrland, I get this. Happens seemingly regardless of installed themes.

  File "/nix/store/2v0vx9w8p16m5xm321zbg73czc9vap8h-python3.12-pygobject-3.50.0/lib/python3.12/site-packages/gi/overrides/Gtk.py", line 814, in _getiter
    aiter = self.get_iter(key)
            ^^^^^^^^^^^^^^^^^^
  File "/nix/store/2v0vx9w8p16m5xm321zbg73czc9vap8h-python3.12-pygobject-3.50.0/lib/python3.12/site-packages/gi/overrides/Gtk.py", line 858, in get_iter
    raise ValueError("invalid tree path '%s'" % path)
ValueError: invalid tree path '0'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/nix/store/fr2kxa956c4dvqg4qf0l1ab9dqss9bi2-themechanger-0.12.0/share/themechanger/themechanger/main.py", line 32, in do_activate
    win = ThemechangerWindow(app=self)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/fr2kxa956c4dvqg4qf0l1ab9dqss9bi2-themechanger-0.12.0/share/themechanger/themechanger/window.py", line 131, in __init__
    self.iconSearchableThemeList = SearchableThemeList(
                                   ^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/fr2kxa956c4dvqg4qf0l1ab9dqss9bi2-themechanger-0.12.0/share/themechanger/themechanger/searchablethemelist.py", line 34, in __init__
    self.setThemesTreeViewModel(themesTreeViewModel)
  File "/nix/store/fr2kxa956c4dvqg4qf0l1ab9dqss9bi2-themechanger-0.12.0/share/themechanger/themechanger/searchablethemelist.py", line 71, in setThemesTreeViewModel
    self.selectTheme()
  File "/nix/store/fr2kxa956c4dvqg4qf0l1ab9dqss9bi2-themechanger-0.12.0/share/themechanger/themechanger/searchablethemelist.py", line 60, in selectTheme
    firstRow = self.themesTreeViewModelFiltered[0]
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^
  File "/nix/store/2v0vx9w8p16m5xm321zbg73czc9vap8h-python3.12-pygobject-3.50.0/lib/python3.12/site-packages/gi/overrides/Gtk.py", line 833, in __getitem__
    aiter = self._getiter(key)
            ^^^^^^^^^^^^^^^^^^
  File "/nix/store/2v0vx9w8p16m5xm321zbg73czc9vap8h-python3.12-pygobject-3.50.0/lib/python3.12/site-packages/gi/overrides/Gtk.py", line 816, in _getiter
    raise IndexError("could not find tree path '%s'" % key)
IndexError: could not find tree path '0'```