Crash with donkey

I'm start the game to see new horse's gui. Spawn donkey, put saddle to his inventory, and they try to place chest on it but my game has crashed.

Steps to Reproduce:
1. Spawn donkey and put saddle on.
2. Try to place chest.
3. Profit

P.S. It was happened only single time.
P.S.S. Thanks for your work! 🙂