If B:"Replace Stone Variant Deposits" is set to false in the config, the stonegenArray will be empty. It causes this crash:

Description: Exception in server tick loop

java.lang.IllegalArgumentException: bound must be positive
at java.util.Random.nextInt(Random.java:388)
at com.oitsjustjose.geolosys.world.StoneGenerator.generate(StoneGenerator.java:67)
at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:167)
at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1015)
at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:995)
at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:157)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:343)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:173)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:196)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:483)
at java.lang.Thread.run(Thread.java:745)

Pretty sure the same thing will happen in OreGenerator.java as well if, for some reason, one were to disable all ore gen.

I'll look into it and have it fixed by 1.5 :)