Looks to be a mod with a recipe which is returning null to Recipe#getResultItem()

I don't know if this is valid by convention - I'm tempted to say the latter and it's a bug with the other mod. However it might also be worth handling this case in TFC as it's fairly easy to just do a null check here.

crash-2023-01-04_18.46.24-client.txt

Original reporter was non-responsive and this isn't a bug in TFC - just happens to be TFC which catches another mod's bad recipe. And I don't want to download ~150 mods individually to track down a single other mod's issue.