Вопрос Почему зависает в гуи гуи?

[vic00450]

Caused by: java.lang.NullPointerException: Cannot invoke "net.minecraft.client.multiplayer.WorldClient.getEntityByID(int)" because "this.clientWorldController" is null
at net.minecraft.client.network.NetHandlerPlayClient.handleEntityEquipment(NetHandlerPlayClient.java:1004) ~[main/:?]
at net.minecraft.network.play.server.SPacketEntityEquipment.processPacket(SPacketEntityEquipment.java:47) ~[main/:?]
at net.minecraft.network.play.server.SPacketEntityEquipment.processPacket(SPacketEntityEquipment.java:11) ~[main/:?]
at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:10) ~[main/:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) ~[?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
at net.minecraft.util.Util.runTask(Util.java:33) ~[main/:?]
... 4 more

 

[abc1337]

Когда именно это происходит? при открытии или инициализации? И про какую гуи ты вообще говоришь?
upd: скинь лог полностью