Total crash when adding text to a FTB Quests quest

[soppitopp]

Modpack

Other...

Modpack version

1.21.1

Launcher

ATLauncher

Has the pack been modified

Yes

Log Files

Latest Log: https://paste.ee/p/e7mTU
Crash log: https://paste.ee/p/nV8OP

Describe the bug

Making quest in my own mod-pack with FTB Quests. When trying to editing the quest text it crash whole Minecraft. (Then I click on the letters on the keyboard)

Steps to reproduce

1: Go to FTB quest in game (UI)
2.: Make a Check Mark quest.
3: click on checkmark quest
4: click D on keyboard to edit/ add text to the quest (It was here the crash occure)

Expected behaviour

Expexted that it would write out text.

Screenshots

Additional information

It is my own mod-pack that I hopefully will publish one day.

where are 315 mods in it, in the moment.

It is Forge.