when i go in the nether i see a big red screen when i go in the nether im like i think i need to report this bug

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
i would go find a place in the nether
with a mob spawner
What actually happened was...:
Describe what happened here
i saw a red screen
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...