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java.lang.Error: 	at java.util.HashMap.getNode(Unknown Source)	at java.util.HashMap.containsKey(Unknown Source)	at java.util.HashSet.contains(Unknown Source)	at refinedstorage.tile.controller.TileController.syncItems(TileController.java:375)	at refinedstorage.tile.controller.TileController.push(TileController.java:423)	at refinedstorage.tile.TileExporter.updateMachine(TileExporter.java:64)	at refinedstorage.tile.TileMachine.func_73660_a(TileMachine.java:66)	at net.minecraft.world.World.func_72939_s(World.java:1797)	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:618)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:707)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:385)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:611)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469)	at java.lang.Thread.run(Unknown Source)