Issue Description: Upon logging into a fresh world the server crashes, only the server, the client remains unaffected, and the client can create new worlds in SSP without issue.

Steps to reproduce:

1. Attempt to log in
2. Crash
3. Cry

Additional Information:

• Server Crash Log: http://pastebin.com/hseSRRu9

Affected Versions:

• Biomes O' Plenty: 1.10.2-5.0.0.2109
• Minecraft: 1.10.2
• Forge: 2151

   Level generator: ID 06 - BIOMESOP, ver 0. Features enabled: true
...
    UCHIJAAAA   RTG{4.1.1.7} [Realistic Terrain Generation] (RTG-1.10.2-4.1.1.7.jar) 

1. If you are loading RTG, then why are you using the BoP WorldType? RTG requires level-type to be set to RTG in your server.properties file.
2. If you are using BoP in conjunction with RTG, then you will also need to use either GeographiCraft (Climate Control) or BiomeTweaker else your world will not have BoP biomes.

I'm not saying this has anything to do with this crash, but you can start there.

1. I'm not "loading RTG" I wanted to have the jar as an option for later testing.
2. Since I'm not using BoP in conjunction with RTG it's moot.

And without the RTG Jar installed the crash still occurs.
http://pastebin.com/9aiNbWSV

Does this occur with just BoP on its own? It seems more likely that one of the coremods has messed something up