I'm having a problem with this mod + quark mod, i already write a issue to vazkii (quark developer), i'm playing on 1.18.2, i've tested both mods alone and it still crashes, here's what quark developer said:
VazkiiMods/Quark#3817 (comment)

Version: 1.18.2
Forgeloader: 40.1.54

How to reproduce:

1. Install this mod
2. Install Quark
3. Click on quark "q" button

Logs:

• Crash Log: https://pastebin.com/0ZJ1uSJv
• Latest Log: https://pastebin.com/W6ChKfVa

in random texture settings you can disable block entity features, you might have to do this for the time being. behind the scenes ETF uses an armour stand as a stand-in for block entities when using those features, quarks armorstand features conflict with this somehow so until i figure a workaround disable all block entity features in ETF's settings

i have added a check to disable the offending feature if quark is detected, i will leave the issue open for now as this is only a half solution

Thanks for your help, it works now, hope you can fix this!

fixed the underlying cause in dev build 4.1.1.dev.3

issue will remain open until the fix is in a stable release

root cause fixed in release 4.2