ASSERT failure in QList<T>::at: "index out of range"

[KiriKira]

The error occurred when using ssf2fcitx (installed via AUR) to the skin in the link followed.
https://pinyin.sogou.com/skins/detail/view/info/560503

[KiriKira]

Detailed error message here.

╭─ ~/Desktop 
╰─$ (*ﾟ∇ﾟ)  ssf2skin -i 颜文字・当你凝视喵喵，喵喵也在凝视着你.ssf -o meow                                                                            2018年10月27日 星期六 12时40分13秒
libpng warning: iCCP: known incorrect sRGB profile
ASSERT failure in QList<T>::at: "index out of range", file /usr/include/qt/QtCore/qlist.h, line 541
fish: 'ssf2skin -i 颜文字・当你凝视喵喵，喵喵也在凝视着你…' terminated by signal SIGABRT (Abort)