Failed to optimize an image produced by imagemagic(compare)

[RazrFalcon]

% oxipng -o 6 -Z diff.png
Processing: diff.png
    144x144 pixels, PNG format
    2 bits/pixel, 3 colors in palette
    IDAT size = 764 bytes
    File size = 1059 bytes
Reducing image to 1 bits/pixel, 2 colors in palette
Trying: 6 combinations
Found better combination:
    zc = 0  zm = 0  zs = 0  f = 0        385 bytes
    IDAT size = 385 bytes (379 bytes decrease)
    file size = 579 bytes (480 bytes = 45.33% decrease)
The resulting image is corrupted and will not be outputted.
This is a bug! Please report it at https://github.com/shssoichiro/oxipng/issues
The resulting image is corrupted

[shssoichiro]

Thanks for reporting this! I'll take a look within the next day or two.