[1.10.2-2.6.19] Client crash on logging in, NPE getting distance to marker

[RealGrep]

I had a server crash while spawning in the wither boss due to another mod. I have removed it until that is fixed. Don't think it is related to this, but I mention it in case. Now, the client crashes immediately as I spawn in (and the wither boss is still there since I can hear him before it crashes).

This is the crash log: http://pastebin.com/xVQhhcNb

This is with MC 1.10.2, MapWriter2 version 2.6.19 and Forge 2093. Let me know if you need anything else. Thank you!

EDIT: Forgot to mention, I'm logging in in the Nether.

[Vectron]

disable ingame markers and the game shouldnt crash, as for why it happens i will have to do some investigating

[RealGrep]

Thank you. :)