When acquiring some models from Tektopia in Metamorph the game crashes

To Reproduce
Steps to reproduce the behavior:

Start a Minecraft world with Tektopia and Metamorph
Open the Metamorph creative menu.
Select an unrendered Tektopia model.
Press acquire

Expected behavior
Either having the morph not appear or having it be glitched.

Screenshots
If applicable, add screenshots to help explain your problem.

** Server/Location **
Survival singleplayer

Additional context
Add any other context about the problem here.
https://paste.dimdev.org/jajuluditi.mccrash

(Copied my bug report from other github so I wouldn't have to write it all again.)

This bug should be fixed in the next Metamorph release. In the meantime, you can download a version with the fix here, it's otherwise the same as Metamorph just named differently:

https://github.com/asanetargoss/Changeling/releases