Minecraft crashes 10 seconds after loading world

Put the summary of the bug you're having here

What I expected to happen was...:
I expected to play the world regularly

What actually happened was...:
The world had succsesfully loaded for 10-20 seconds and it suddenly crashes

Steps to Reproduce:
1. Click "Play" on minecraft launcher
2. Click Play World on that particular world.
3. After 10 secondsof fully loading the world, It crashes !!