Minecraft v1.8.9
Issue: When you search for dimlets using JEI, and you hover your mouse over the symbol, your client crashes. Through in-game testing, it appears to affect most or all of the grey colored dimlet icons, screenshot of affected icons outlined below
Repeatability: This issue was repeated across multiple clients, one running Windows 8.1, another running Arch Linux
Screenshot:

Crash Report:
crash-2016-03-17_22.10.21-client.txt

I could not reproduce this but I did a blind fix for next version