Looking at the error, it's obvious the problem is from the lib (red for clarity):
Code:
user:/AddOns/DolgubonsLazySetCrafter/Libs/LibLazyCrafting/LibLazyCrafting.lua:235: attempt to index a nil value
stack traceback:
user:/AddOns/DolgubonsLazySetCrafter/Libs/LibLazyCrafting/LibLazyCrafting.lua:235: in function 'LibLazyCrafting.stackableCraftingComplete'
user:/AddOns/WritWorthy/Libs/LibLazyCrafting/Provisioning.lua:69: in function 'LLC_ProvisioningCraftingComplete'
user:/AddOns/DolgubonsLazyWritCreator/libs/LibLazyCrafting/LibLazyCrafting.lua:453: in function 'CraftComplete'
Diagnosing the cause of the problem and fixing it may be less obvious.