20:05:08  [Warn] Failed to handle packet for /86.27.12.228:12826java.lang.NullPointerException	at cpw.mods.fml.common.network.internal.FMLProxyPacket.func_148833_a(FMLProxyPacket.java:101) ~[FMLProxyPacket.class:?]	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) ~[ej.class:?]	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165) [nc.class:?]	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659) [MinecraftServer.class:?]	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) [lt.class:?]	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) [MinecraftServer.class:?]	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?]	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]
20:05:08  [Error] Encountered an unexpected exceptionnet.minecraft.util.ReportedException: Ticking block entity	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:642) ~[MinecraftServer.class:?]	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) ~[lt.class:?]	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) ~[MinecraftServer.class:?]	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?]	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]Caused by: java.lang.IllegalArgumentException: Multiple entries with same key: [4, -4]=[net.minecraftforge.common.ForgeChunkManager$Ticket@4a3e9782] and [3,4,-4]=[net.minecraftforge.common.ForgeChunkManager$Ticket@7bf5c0de] at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:150) ~[guava-17.0.jar:?]	at com.google.common.collect.RegularImmutableMap.checkNoConflictInBucket(RegularImmutableMap.java:104) ~[guava-17.0.jar:?]	at com.google.common.collect.RegularImmutableMap.<init>(RegularImmutableMap.java:70) ~[guava-17.0.jar:?]	at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:254) ~[guava-17.0.jar:?]	at com.google.common.collect.ImmutableSetMultimap.copyOf(ImmutableSetMultimap.java:333) ~[guava-17.0.jar:?]	at com.google.common.collect.ImmutableSetMultimap.access$000(ImmutableSetMultimap.java:65) ~[guava-17.0.jar:?]	at com.google.common.collect.ImmutableSetMultimap$Builder.build(ImmutableSetMultimap.java:279) ~[guava-17.0.jar:?]	at net.minecraftforge.common.ForgeChunkManager.forceChunk(ForgeChunkManager.java:743) ~[ForgeChunkManager.class:?]	at mods.railcraft.common.blocks.machine.alpha.TileAnchorWorld.forceChunkLoading(TileAnchorWorld.java:391) ~[TileAnchorWorld.class:?]	at mods.railcraft.common.blocks.machine.alpha.TileAnchorWorld.requestTicket(TileAnchorWorld.java:327) ~[TileAnchorWorld.class:?]	at mods.railcraft.common.blocks.machine.alpha.TileAnchorWorld.func_145845_h(TileAnchorWorld.java:289) ~[TileAnchorWorld.class:?]	at net.minecraft.world.World.func_72939_s(World.java:1939) ~[ahb.class:?]	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489) ~[mt.class:?]	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636) ~[MinecraftServer.class:?]	... 4 more
20:05:08  [Error] This crash report has been saved to: /home/minecraft/mc-instances/mc-56b783f1572fc/./crash-reports/crash-2016-02-14_20.05.08-server.txt
20:05:08  [Info] Stopping server
20:05:08  [Info] Saving players
20:05:08  [Info] Saving worlds
20:05:08  [Info] Saving chunks for level 'world'/Overworld
20:05:08  [Info] Saving chunks for level 'world'/Nether
20:05:08  [Info] Saving chunks for level 'world'/Twilight Forest
20:05:08  [Info] Saving chunks for level 'world'/Underdark
20:05:08  [Info] Saving chunks for level 'world'/Dungeon
20:05:08  [Info] Saving chunks for level 'world'/Spirit World
20:05:08  [Info] Saving chunks for level 'world'/Torment
20:05:08  [Info] Saving chunks for level 'world'/Mirror
20:05:08  [Info] Saving chunks for level 'world'/Bedrock
20:05:08  [Info] Saving chunks for level 'world'/The Outer Lands
20:05:08  [Info] Saving chunks for level 'world'/The Last Milleniu
20:05:08  [Info] Saving chunks for level 'world'/rftools dimension
20:05:08  [Info] Saving chunks for level 'world'/rftools dimension