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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)