Minecraft v1.16.4
Forge v35.1.13
Botania v410
Botania Additions v1.0.3

I was in creative trying out the Terra Harvester when I broke a tall grass plant but crashed instead.
Crash Report

This crash is due to a change in botania.
I remember seeing that method getting changed, but it seems like i forgot to change how Botania Additions handles that.
This will hopefully be fixed tomorrow.

Should be Fixed in version 1.16.4-1.0.4, now approved on CurseForge.

Thanks!