Forge version: 14.23.1.2587
Botania version: r1.10-352
Link to crash log: gist

Steps to reproduce:

1. Equip Flügel Tiara,
2. Have a Greater Band of Mana in inventory
3. Attempt to fly.

What I expected to happen:
Fly and not crash.

What happened instead:
Crash to desktop.

Also tested with Forge version: 14.23.1.2560.

same root cause as #2509, redirecting there