When i am playing multiplayer it keeps crashing while im fighting or running.

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What I expected to happen was...:
Describe what you thought should happen here
I expected to be able to keep running and get away.
What actually happened was...:
Describe what happened here
As I was running it crashed.
Steps to Reproduce:
Put a step by step guide on how to trigger the bug here
1. It just happens every time I'm fighting a mob or trying to build.