Description: Ticking block entity

java.lang.NullPointerException: Ticking block entity
	at flaxbeard.steamcraft.block.BlockPipe.func_149731_a(BlockPipe.java:348)
	at net.minecraft.world.World.func_147447_a(World.java:1049)
	at net.minecraft.world.World.func_72933_a(World.java:1024)
	at flaxbeard.steamcraft.tile.TileEntityVacuum.func_145845_h(TileEntityVacuum.java:132)
	at net.minecraft.world.World.func_72939_s(World.java:1939)
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- Head --
Stacktrace:
	at flaxbeard.steamcraft.block.BlockPipe.func_149731_a(BlockPipe.java:348)
	at net.minecraft.world.World.func_147447_a(World.java:1049)
	at net.minecraft.world.World.func_72933_a(World.java:1024)
	at flaxbeard.steamcraft.tile.TileEntityVacuum.func_145845_h(TileEntityVacuum.java:132)

-- Block entity being ticked --
Details:
	Name: steamcraft:vacuum // flaxbeard.steamcraft.tile.TileEntityVacuum
	Block type: ID #1015 (tile.steamcraft:vacuum // flaxbeard.steamcraft.block.BlockVacuum)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (4338,71,119), Chunk: (at 2,4,7 in 271,7; contains blocks 4336,0,112 to 4351,255,127), Region: (8,0; contains chunks 256,0 to 287,31, blocks 4096,0,0 to 4607,255,511)
	Actual block type: ID #1015 (tile.steamcraft:vacuum // flaxbeard.steamcraft.block.BlockVacuum)
	Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
	at net.minecraft.world.World.func_72939_s(World.java:1939)
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)