Describe the bug
Crash when opening spirit trader GUI.
Created based on additional context in #4

To Reproduce
Steps to reproduce the behavior:

1. Spawn trader
2. Shift-click to open gui
3. Crash

Expected behavior
The gui opens without a crash.

System (please complete the following information):

• Occultism Version: 0.2.2
• OS: [e.g. Windows]
• Minecraft Version:
• Modpack Link and Version, or list of mods:

this crash seems to be fixed in 0.2.3!