https://pastebin.com/bNUnLMTe

Versions:
guidebook-1.12.2-2.0.1
gigaherz.commons-1.12.1-0.6.4
MC Version 1.12.2
Forge 14.23.2.2652
Java 1.8.0_161

Any chance I can have a copy of the book that is being loaded, or some more information? The crash is somewhere that shouldn't be crashing, so that seems to me like something else is going wrong elsewhere, but I need to be able to reproduce the crash in order to track down where.

I think the only Books I have are from Rockhounding Chemistry and I am not sure prob. Blood Magic

Okay thanks, I'll take a look as soon as I can.

I went in-Game to check the books and recreated the crash.
Books are only the default manual and Rockhounding Chemistry avaible.
Also at recreating the crash I found something that may be interesting

[03:19:49] [main/WARN] [gbook]: 's specified output item '1xitem.comparator@0' does not have a recipe for type 'gbook:shaped'
[03:19:49] [main/WARN] [gbook]: [CraftingRecipeProvider] index '0' was not found in the list of cached shaped recipes for '1xitem.comparator@0'. Falling back to the first occurrence.
[03:19:49] [main/ERROR] [gbook]: [CraftingRecipeProvider] shaped Recipe not found although hasRecipe(...) returned true. Something is wrong!