java.lang.NullPointerException: Exception in server tick loop
	at org.dimdev.dimdoors.shared.blocks.BlockFloatingRift.func_180663_b(BlockFloatingRift.java:52)
	at net.minecraft.world.chunk.Chunk.bridge$setBlockState(Chunk.java:3757)
	at org.spongepowered.common.event.tracking.PhaseTracker.setBlockState(PhaseTracker.java:892)
	at net.minecraft.world.WorldServer.func_180501_a(WorldServer.java:4517)
	at com.github.alexthe666.iceandfire.world.gen.WorldGenCyclopsCave.func_180709_b(WorldGenCyclopsCave.java:50)