I`m play on a server and i have a zombie spawner when a zombie spawnt my minecraft crashed

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2.I have spawner and droop this
3. than a zombie spawnt and my minecraft crashed i can`t look the zombie my minecraft crashed