Catfish doesn't start on wayland [Archlinux]

~ ▶ catfish 
Traceback (most recent call last):
  File "/usr/bin/catfish", line 44, in <module>
    catfish.main()
  File "/usr/lib/python3.9/site-packages/catfish/__init__.py", line 78, in main
    window = CatfishWindow.CatfishWindow()
  File "/usr/lib/python3.9/site-packages/catfish_lib/Window.py", line 176, in __new__
    new_object.finish_initializing(builder)
  File "/usr/lib/python3.9/site-packages/catfish/CatfishWindow.py", line 327, in finish_initializing
    (screen_width, screen_height) = self.get_screen_size()
  File "/usr/lib/python3.9/site-packages/catfish/CatfishWindow.py", line 405, in get_screen_size
    geometry = monitor.get_geometry()
AttributeError: 'NoneType' object has no attribute 'get_geometry'

Tried it under GNOME and sway, seems it just doesn't want to run in a wayland session. It launches normally with GDK_BACKEND=x11 set.