I'm having issues with the quest editing interface crashing. This can be replicated at least on my computer by clicking the search bar in the item selection dialogue box multiple times very rapidly. But it can also happen when clicking other parts of the interface, and the errors appear nearly or very nearly identical.

Example crashlog, happened randomly, not sure what button I pressed: https://pastebin.com/Pq4MKD5C
Example 2, happened by spamming click on the search bar: https://pastebin.com/jgpr0n02

I am using version 2.4.235 of the mod with Forge 13.20.0.2304