Issue Description:

Trying to load a new world with the Biomes O PLenty worldtype causes a crash with logCascadingWorldGeneration. It is ompossible to load any world with this world type currently.
crash-2017-05-07_13.05.31-server.txt

How to reproduce:

1. Click Create New World and Set World Type to "Biomes o' Plenty".
2. Click Create New World
3. Wait for the crash

Affected Versions:

• Biomes O' Plenty: BiomesOPlenty-1.11.2-6.1.0.2211-universal
• Minecraft: 1.11.2
• Forge: 1.11.2-forge1.11.2-13.20.0.2228

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