Two crash reports with NPE are produced when leaving server via "Back to main menu"

[PolyacovYury]

Well, the title says it.

Description: Error executing task

java.util.concurrent.ExecutionException: java.lang.NullPointerException
    at java.util.concurrent.FutureTask.report(Unknown Source)
    at java.util.concurrent.FutureTask.get(Unknown Source)
    at net.minecraft.util.Util.runTask(SourceFile:531)
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1087)
    at net.minecraft.client.Minecraft.run(Minecraft.java:4440)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    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:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
    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 com.skcraft.launcher.launch.Starter.main(Starter.java:100)
Caused by: java.lang.NullPointerException
    at net.minecraft.client.network.NetHandlerPlayClient.handleUpdateHealth(NetHandlerPlayClient.java:1034)
    at net.minecraft.network.play.server.SPacketUpdateHealth.processPacket(SourceFile:38)
    at net.minecraft.network.play.server.SPacketUpdateHealth.processPacket(SourceFile:8)
    at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:20)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at net.minecraft.util.Util.runTask(SourceFile:529)
    ... 14 more

Description: Error executing task

java.util.concurrent.ExecutionException: java.lang.NullPointerException
    at java.util.concurrent.FutureTask.report(Unknown Source)
    at java.util.concurrent.FutureTask.get(Unknown Source)
    at net.minecraft.util.Util.runTask(SourceFile:531)
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1087)
    at net.minecraft.client.Minecraft.run(Minecraft.java:4440)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    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:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
    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 com.skcraft.launcher.launch.Starter.main(Starter.java:100)
Caused by: java.lang.NullPointerException
    at net.minecraft.client.network.NetHandlerPlayClient.handleEntityProperties(NetHandlerPlayClient.java:2084)
    at net.minecraft.network.play.server.SPacketEntityProperties.processPacket(SourceFile:70)
    at net.minecraft.network.play.server.SPacketEntityProperties.processPacket(SourceFile:15)
    at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:20)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at net.minecraft.util.Util.runTask(SourceFile:529)
    ... 14 more

[xJon]

Also getting these crashes with VanillaFix, build 99, pretty often. Is there any way around it? Seems like I have to choose between crashing not very often to desktop, or crashing pretty often but only to main menu due to server-sync/concurrency issues. Currently I'll choose the second one.