Crashes with Catharsis mod #1026

Crosspost of meowdding/catharsis#262 by request of j10a1n15

Game proceeds to crash after these circumstances while having Catharsis mod + CPM installed:

1. Custom Model modifies armor by adding extra cube to it
2. Catharsis compatible pack (e.g Fursky Reborn) is enabled and has custom armor textures
3. Game attempts to render player's model while wearing armor customized by texturepack

More detailed report of this bug can be found in issue mentioned above