this crash doesn't occurs everytime, it's a little bit random. It happened to me while using the dimension changer item from aroma's mining dimension mod but not at every try (sometimes it works and sometimes it crashes)

here is the crash report : https://pastebin.com/pHB7QcSW

i'm not sure that is your problem so i will also report it to the librarianlib mod issue tracker. TeamWizardry/LibrarianLib#123

Closing since this is indeed a race condition in LibrarianLib.