Error: java.lang.NullPointerException: Ticking memory connection

I was playing in my survival world which I jad played on the day before. I opened it in LAN to /kill myself. When I tried to log in the game kept crashing when it got to the Building Terrain stage. My other worlds work fine. 

Error message:

The game crashed whilst ticking memory connection
Error: java.lang.NullPointerException: Ticking memory connection