Minecraft version: 1.12.2
Wizardry version: 4.2.1
Environment: Singleplayer

Issue details:
The game crashed when i tried to cast the Ice lance spell, when i cast it without my neutral master wand (2 slot , 2 cooldown and 2 storage upgrade) it doesn't crash (wands had no upgrade). Also i still hear the sound of the projectile breaking when i come back in the game.

Link to crash report:
https://paste.dimdev.org/ridupozace.mccrash
or
https://pastebin.com/R8EmrWbS

I kept playing around and it only crashes because i cast spell with the 7th slot of my master wand.

This is similar to your other issue #176... is it the same wand? It may be that the NBT broke somehow with the update.

yes same wand maybe because it is also enchanted with unbreaking 3.

This bug also happened with another wand on the 6th slot (it had a slot upgrade)