Put the summary of the bug you're having here

What I expected to happen was...:
I would place a chest on a donkey and would be able to put items in the inventory.

What actually happened was...:
The game crashed ( it closed itself and popped up with a bug report thing)

Steps to Reproduce:
1. Spawn a donkey from a horse egg
2. tame it and put a saddle on it
3. click on the donkey with a chest, and click on the donkey again