Windows .exe FTB Ultimate - disconnect on using Mystcraft books

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benkc

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Jul 29, 2019
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FTB Launcher version: 1.2.2
Minecraft Version: 1.4.7
Java version: Java 7 Update 5
Detailed description of the issue / how can the issue be recreated:
Use any Mystcraft book to switch dimensions. Descriptive book or Linking book, either direction.
User will switch dimensions, get a glimpse of their destination, then be booted from the server.
Doesn't occur in single player, only multiplayer.
We're running with the configs from this thread: http://forum.feed-the-beast.com/thr...brutality-mode-everything-else-included.9536/
but I also tried it out with a stock Ultimate server/client, and got the same.
Error logs:
Client gets a "Disconnect by Server / Internal Server Error", server logs show something like this:

Code:
[WARNING] Failed to handle packet for playername/playerip: java.lang.NullPointerException
java.lang.NullPointerException
    at codechicken.nei.NEIServerUtils.isMagnetMode(NEIServerUtils.java:365)
    at codechicken.nei.ServerPacketHandler.handlePacket(ServerPacketHandler.java:60)
    at codechicken.core.PacketCustom$ServerPacketHandler.handle(PacketCustom.java:125)
    at codechicken.core.PacketCustom$CustomPacketHandler.onPacketData(PacketCustom.java:74)
    at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:243)
    at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:233)
    at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:71)
    at iv.a(NetServerHandler.java:1110)
    at di.a(SourceFile:59)
    at cg.b(TcpConnection.java:458)
    at iv.d(NetServerHandler.java:136)
    at iw.b(NetworkListenThread.java:57)
    at ht.b(SourceFile:30)
    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:703)
    at ho.r(DedicatedServer.java:269)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:599)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
    at fy.run(SourceFile:849)
 
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