hypnotizd:
Loaded the latest version of Kappa, pulled my tier 1 redstone dank null out of my storage rack and put on my hot bar and immediately crashed
https://pastebin.com/eu4VESsP
I loaded back up and tried selecting it on the hot bar by scrolling my mouse wheel and as soon as it would highlight it crashes instantly.

I'm getting the same crash. :(

Note that the server did not crash, only the client. here's the crash log:
https://pastebin.com/ihj65ELb

Minecraft 1.12.2
Forge 2847
/dank/null 1.7.88
pwlib 2.3.161

Verified fixed in 1.7.89. Thank you @p455w0rd for all your work!