Crash involving TransformerBlockBOPFlower and TFC stone

[Exsolutus]

While generating a world with a stone type from TFC replacing vanilla stone in the overworld, I get the following crash involving NetherAPI and BOP.

java.lang.ArrayIndexOutOfBoundsException: Index 9 out of bounds for length 7
    at net.dries007.tfc.objects.blocks.stone.BlockRockVariant.canSustainPlant(BlockRockVariant.java:331)
    at git.jbredwards.nether_api.mod.asm.transformers.modded.biomesoplenty.TransformerBlockBOPFlower$Hooks.getSoilBlock(TransformerBlockBOPFlower.java:70)
    at biomesoplenty.common.block.BlockBOPFlower.canBlockStay(BlockBOPFlower.java:269)
    at biomesoplenty.common.world.generator.GeneratorFlora.generate(GeneratorFlora.java:125)
    at biomesoplenty.api.generation.BOPGeneratorBase.scatter(BOPGeneratorBase.java:95)
    at biomesoplenty.common.world.generator.GeneratorWeighted.scatter(GeneratorWeighted.java:116)
    at biomesoplenty.common.handler.decoration.DecorateBiomeEventHandler.runGeneratorStage(DecorateBiomeEventHandler.java:88)
    at biomesoplenty.common.handler.decoration.DecorateBiomeEventHandler.onBiomeDecorate(DecorateBiomeEventHandler.java:46)
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:79)
    at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:204)
    at net.minecraftforge.event.terraingen.TerrainGen.decorate(TerrainGen.java:88)
    at net.minecraft.world.biome.BiomeDecorator.genDecorations(BiomeDecorator.java:159)
    at net.minecraft.world.biome.BiomeDecorator.decorate(BiomeDecorator.java:94)
    at net.minecraft.world.biome.Biome.decorate(Biome.java:225)
    at net.minecraft.world.biome.BiomeHills.decorate(BiomeHills.java:45)
    at rtg.api.world.biome.IRealisticBiome.rDecorate(IRealisticBiome.java:182)
    at rtg.world.gen.ChunkGeneratorRTG.populate(ChunkGeneratorRTG.java:364)
    at net.minecraft.world.chunk.Chunk.populate(Chunk.java:1023)
    at net.minecraft.world.chunk.Chunk.populate(Chunk.java:984)
    at net.minecraft.world.gen.ChunkProviderServer.provideChunk(ChunkProviderServer.java:157)
    at net.minecraft.server.management.PlayerChunkMapEntry.providePlayerChunk(PlayerChunkMapEntry.java:131)
    at net.minecraft.server.management.PlayerChunkMap.tick(PlayerChunkMap.java:226)
    at net.minecraft.world.WorldServer.tick(WorldServer.java:231)
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:786)
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:698)
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:279)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:2392)
    at java.lang.Thread.run(Thread.java:1474)