Error regenerating colorscheme

[cherrynoize]

wpg -R pink.png gives the following error:

Traceback (most recent call last):
  File "/sbin/wpg", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/__main__.py", line 305, in main
    process_args(args)
  File "/usr/lib/python3.11/site-packages/wpgtk/__main__.py", line 222, in process_args
    add_action(glob.glob(x)[0])
  File "/usr/lib/python3.11/site-packages/wpgtk/data/themer.py", line 24, in create_theme
    return color.get_color_list(filename)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/data/color.py", line 52, in get_color_list
    color_list = auto_adjust(color_list)
                 ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/data/color.py", line 150, in auto_adjust
    colors = smart_sort(colors)
             ^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/data/color.py", line 130, in smart_sort
    closest_cds = [sorted_by_color[x][0] for x in range(8)]
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/data/color.py", line 130, in <listcomp>
    closest_cds = [sorted_by_color[x][0] for x in range(8)]
                   ~~~~~~~~~~~~~~~~~~^^^
IndexError: list index out of range
[i] image         Using image pink.png.
[i] colors        Generating a colorscheme.
[i] colors        Using wal backend.
[i] colors        Generation complete.
Traceback (most recent call last):
  File "/sbin/wpg", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/__main__.py", line 305, in main
    process_args(args)
  File "/usr/lib/python3.11/site-packages/wpgtk/__main__.py", line 257, in process_args
    any(themer.reset_theme(arg) for arg in args.R)
  File "/usr/lib/python3.11/site-packages/wpgtk/__main__.py", line 257, in <genexpr>
    any(themer.reset_theme(arg) for arg in args.R)
        ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/data/themer.py", line 77, in reset_theme
    return color.get_color_list(theme_name)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/data/color.py", line 52, in get_color_list
    color_list = auto_adjust(color_list)
                 ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/data/color.py", line 150, in auto_adjust
    colors = smart_sort(colors)
             ^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/data/color.py", line 130, in smart_sort
    closest_cds = [sorted_by_color[x][0] for x in range(8)]
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/wpgtk/data/color.py", line 130, in <listcomp>
    closest_cds = [sorted_by_color[x][0] for x in range(8)]
                   ~~~~~~~~~~~~~~~~~~^^^
IndexError: list index out of range

I did run wpg -a pink.png before that successfully, and after the error I can still set the wallpaper with wpg -s pink.png but it is using a previous colorscheme.

This only happens with pink.png and not (say) with black.png or other images in the directory, but I'm pretty sure this has happened after I ran optipng on the image to optimize it. Though I tried running optipng on an image which had not yet been set as wallpaper and it works fine with wpg. I must assume there's some issue because the image data has changed but I wouldn't know exactly how to solve this. I tried looking for and removing pink.png-ish files in ~/.config/wpg/ under schemes and wallpapers but still get the same error.