Crashes/fails to convert high Unicode codepoints like Emojis

[HenryYong95]

On Google Chrome, https://r12a.github.io/app-conversion/ (version 9) crashes when you ask it to convert high encode code points like emojis e.g. 👽 (U+1F47D ). To reproduce, I

1. open https://r12a.github.io/app-conversion/
2. Paste the Alien Emoji (👽) into either the Green input box or 'Characters' input box.
3. Click 'Convert' and I get Google's "Aw, Snap! Something went wrong while displaying this webpage."

This use to work the last time I recall putting an emoji into this app (🔥 U+1F525 back in May 2017).

As a side note, I'm a huge fan of this app. I have been using it for several years now. Keep up the good work!