• Minecraft Version: 1.10.2
• BetterFps Version: 1.4.4
• Forge/LiteLoader Version (if any): 12.18.3.2281
• Crash Logs (if any): None
• Other Mods (if any): Many, Can provide if needed.

https://pastebin.com/J2N8pGKv

Thanks for sending the crash report. The bug is related to the asynchronous/multithreaded creative search, you can disable it for now

I've also experienced a similar issue, except I had a different crash. It's caused by the changes you make to the internals though, so I thought I should link it too.

Stack trace: https://paste.ee/p/uVVl0

To quote mezz:

if you use threads to modify something that can't handle it, like this list, it will often break when the next thing tries to use it, so your crash is just a normal use of the list, that happened after or during the betterfps thread

Yes, he is right. It's my fault, I didn't fully test it or thought it through as I should've

Should be fixed now. I'll be releasing a new version soon, feel free to reopen this issue if the problem persists :)

The new version with the fix is out. Sorry for taking too long to fix it D: