Conjuring version 1.0.26+1.19.3, on Fabric with PrismLauncher
I inserted a sheep conjuring focus into a conjurer and my game immediately crashed. After restarting the game and loading my world, the focus was in the conjurer and I was able to remove it, but when I tried to put it back in the game crashed again.

I have many other fabric mods installed, but I'm not sure if any could be causing issues.

Here's the report from the second crash:
crash-2023-03-09_19.25.03-server.txt