I cant join a server and everytime i join a single player world i crash plz fix

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
I should be able to go to a server

What actually happened was...:
Describe what happened here
Idk what happened it happen randomly

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... ?
3. ...?