I keep getting an odd internal server crash when switching clones im currently using sync 4.0.0
I think this is the log im using it in a private mod pack with 149 mods it might be a compatibility issue but anyway is there a way to fix this by removing a mod

23:10:41] [Client thread/ERROR] [FML]: There was a critical exception handling a packet on channel Sync
net.minecraft.util.ReportedException: Loading entity NBT
at net.minecraft.entity.Entity.func_70020_e(Entity.java:1445) ~[sa.class:?]
at sync.common.packet.PacketNBT.handleClient(PacketNBT.java:46) ~[PacketNBT.class:?]
at sync.common.packet.PacketNBT.execute(PacketNBT.java:39) ~[PacketNBT.class:?]
at ichun.common.core.network.ChannelHandler$PacketExecuter.channelRead0(ChannelHandler.java:84) ~[ChannelHandler$PacketExecuter.class:?]
at ichun.common.core.network.ChannelHandler$PacketExecuter.channelRead0(ChannelHandler.java:66) ~[ChannelHandler$PacketExecuter.class:?]
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98) ~[SimpleChannelInboundHandler.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) ~[DefaultChannelHandlerContext.class:?]
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[MessageToMessageDecoder.class:?]
at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111) ~[MessageToMessageCodec.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) ~[DefaultChannelPipeline.class:?]
at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:169) ~[EmbeddedChannel.class:?]
at cpw.mods.fml.common.network.internal.FMLProxyPacket.func_148833_a(FMLProxyPacket.java:77) [FMLProxyPacket.class:?]
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) [ej.class:?]
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(PlayerControllerMP.java:273) [bje.class:?]
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1591) [bao.class:?]
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:962) [bao.class:?]
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887) [bao.class:?]
at net.minecraft.client.main.Main.main(SourceFile:148) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_67]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134) [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
Caused by: java.lang.NullPointerException
at net.minecraft.entity.Entity.func_70020_e(Entity.java:1367) ~[sa.class:?]
... 26 more
[23:10:41] [Netty Client IO #0/INFO] [THAUMCRAFT]: Restoring client configs.
[23:10:41] [Server thread/INFO]: Bluebaron2 lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[23:10:41] [Server thread/INFO]: Bluebaron2 left the game
[23:10:41] [Server thread/INFO] [Sync]: Bluebaron2 logged out mid-sync whilst sync process was at 29
[23:10:41] [Server thread/INFO]: Stopping singleplayer server as player logged out
[23:10:41] [Server thread/INFO] [Mekanism]: VoiceServer: Shutting down server...
[23:10:41] [Server thread/INFO]: Stopping server
[23:10:41] [Server thread/INFO]: Saving players
[23:10:41] [Server thread/INFO]: Saving worlds
[23:10:41] [Server thread/INFO]: Saving chunks for level 'SURohsdfohq'/Overworld

sorrey forgot the mod list
LOTR mod
armour statusHUD
StatusEffectHUD
MB Battle gear
Advanced Genetics
Appliedenergistics
Archemedies Ships
Aroma core
Aroma backup
automagey
backpack
betterstorage
Bigreactors
Binnemods
Bloodmagic
Botainia
Buildcraft
BWG4
Carpenters blocks
CGorigen
Weepingangels
Chisel
Codechickencore
CoFHcore
CoFHLib
Computercraft
Cookiecore
Deathcounter
Dragonapi
Dragon mounts
Dynamicswordskills
Eirairc
Enchiridon
EnderIO
Endertech
Extracarts
Extrautillites
Fastcraft
FlaxbeardSteampower
Forestry
Glaticraftcore
Galaticraftplanets
Gravestone
Hardcore ender expansion
HQM
iChunutil 4.0.0
Indutrialcraft experimental
Indutrialcraft experimental API
Infernalmobs
Invasion
jabba
Logisticpipes
Magical crops
Mantle
Mariculture
Mechanism
Mechanism generators
Mechanism Tools
Micdoodlecore BETA
minefactory reloaded
minetweaker (not used
Modtweaker (not used
Morph beta 0.9.0
mystcraft
Natura
Newbiosphersmod
NEI
Openblocks
OpenmodsLib
Openmodular turrets
Railcraft
Random Things
Redstaone Arsenal
Rougelike
Rotarycraft
Ruins
RWG Alpha
santasdeco
santas toys
secretroomsmod
SpecialAI
specialMobs
Starminer
Stevie's carts
Sync 4.0.0
TConstruct
Thaumcraft 4.2.0.1
Thumictinkerer
Thermal Expansion
Thermal foundation
Tictooltips
Tmechworks
Twilightforrest
Updatecheacker mod
Witchery

actually nothing to do with that just has this error on one world

I am really sorry about the amount of messages the last crash report was not the one that is causing the issue I fixed that one but for some reason this one doesn't generate any crash log just in the log it says

There was a critical exception handling a packet on channel Sync
net.minecraft.util.ReportedException: Loading entity NBT

I have removed all mods and reloaded one by one but I couldn't reproduce the error except in 1 world each time I switched between shells or shell storages, however in new worlds shells work perfectly fine.