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Whenever i try to JUMP, my game crashes
My Mods:
Orespawn Mos Chickens
Twillight Forest Ninja Mod
Ruins
Dungeon Pack
Optifine
Dungeon Mobs
Better Dungeons
Back Packs
Animal Bikes
Mutant Creatures
Familiars
N.E.I
Damage Indicators
Derpy Squids
Erubus
Better Furnace
Ultimate Tools
Creeper Species
Golem World
Lycanites Mobs
Miners Deluxe


This is the Crash Report:
--- Minecraft Crash Report ----
// I let you down. Sorry

Time: 12/29/13 7:35 PM
Description: Exception in world tick

java.lang.NullPointerException
at net.minecraft.client.multiplayer.NetClientHandler.func_72519_a(NetClientHandler.java:956)
at net.minecraft.network.packet.Packet24MobSpawn.func_73279_a(SourceFile:87)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
at net.minecraft.client.multiplayer.WorldClient.func_72835_b(WorldClient.java:99)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1930)
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)