What happened?

Using my modpack, when I search something in search bar, can crash or not, I don't know the probability.

What mod loaders are you seeing the problem on?

Forge

What do you think this bug is of?

• Visual
• Recipe Lookup
• Cheat Mode
• Plugin Integration / JEI Plugin Compatibility
• Others

Relevant log output

Rei.log — https://gist.github.com/Luppyn/e4c0f5edeb172df8ec799b2c84edd520
Latest.log — https://gist.github.com/Luppyn/7ec6e0afbc4e034774313e6cb1704235

Anything else?

Modpack↗

REI is not compatible with optifine. The general consensus with optifabric is that if it works, it works, if it doesn't work, then too bad.
Optifine is not open sourced, we cannot fix it.