[Python] PIL getcolors returning None for some particular images

I am getting weird behaviour when using PIL, here is my code:

main_img = Image.open(image_url)
all_colors = main_img.getcolors(maxcolors=100000)


when I use this image:



everything works perfectly, but when I use this:



PIL literally returns None. I am very confused.

Note: The second image is absolutely massive, unlike the first.

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