When joining a local server my client crashed with the following error using Hats2.1.0 and iChunUtil2.4.0:

net.minecraft.util.ReportedException: Ticking screen
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1587)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Caused by: java.lang.NullPointerException
at hats.common.core.ConnectionHandler.connectionClosed(ConnectionHandler.java:79)
at cpw.mods.fml.common.network.NetworkRegistry.connectionClosed(NetworkRegistry.java:219)
at cpw.mods.fml.common.network.FMLNetworkHandler.onConnectionClosed(FMLNetworkHandler.java:331)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:471)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(GuiConnecting.java:51)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1580)[/spoiler]

ForgeModLoader-client-0.log: http://paste2.org/tUj2n5ky

This would only happen if the moment you logged in, the server kicked you out due to some other error. You fix that error, you fix this, but I'll prevent this from happening my end anyways.