General Information

At the start of crafting items on a pyre or fey crafter the game crashes with a server connection error (I'm playing single player)
But the last time it issued such an error with a crash log (attached)
crash-2021-10-06_23.42.06-client.txt

you put all the necessary items on the pyre, set it on fire - the game crashes
also with fey crafter

Can you try updating to 3.1.3?

But where i can find it? latest version on curseforge it's 3.1.2

That's... strange, for some reason I thought 3.1.3 was the latest, my bad. It looks like I did miss an instance of Minecraft potentially being null, but I don't understand why the world is null. It doesn't make any sense. Are you using Optifine or a specific launcher?

I use GDLauncher
Without optifine

Can you try 3.1.4? I released 3.1.3 but it had a dependency issue, so it's been archived. The latest is now 3.1.4, which requires MysticalLib 1.13.