Steps to reproduce the crash:

1. add flans mod and tinkers' compendium
2. attempt to get into a vehicle from Flan's (mine was the english fighter plane)
3. get rendering crash

Versions (please complete the following information):

• Forge: 1.12.2 - 14.23.5.2810
• Flan's Mod: 1.12.2-5.6

https://paste.dimdev.org/sipofiquma.mccrash

Looks like this crash comes from Tinkers-Compendium.