Crash upon entering world

[Pokechu22]

[Originally reported by codahq on the forums]

On some servers, in some circumstances, upon joining the game would immediately crash. This occurred in both the liteloader version and coremod version.

Crash report:

---- Minecraft Crash Report ----

WARNING: coremods are present:
  BetterFoliageLoader (BetterFoliage-mc1.8-1.1.5.jar)
  FMLPlugin (InventoryTweaks-1.59-176.jar)
  CCLCorePlugin (CodeChickenLib-1.8-1.1.2.133-universal.jar)
  SmartCorePlugin (SmartMoving-1.8-16.1.jar)
  PlayerAPIPlugin (PlayerAPI-1.8-1.3.jar)
  CodeChickenCorePlugin (CodeChickenCore-1.8-1.0.5.36-universal.jar)
  ItemPatchingLoader (ItemPhysic Lite 1.1.3 mc1.8.jar)
  CCCDeobfPlugin (unknown)
  RenderPlayerAPIPlugin (RenderPlayerAPI-1.8-1.4.jar)
  DLFMLCorePlugin (DynamicLights-1.8.jar)
  NEICorePlugin (NotEnoughItems-1.8-1.0.5.104-universal.jar)
  LoadingPlugin (PixelCam-1.2.jar)
Contact their authors BEFORE contacting forge

// Don't be sad. I'll do better next time, I promise!

Time: 7/21/15 1:08 AM
Description: WDL mod: exception in onWorldRemoveEntityFromWorld event

java.lang.NullPointerException: WDL mod: exception in onWorldRemoveEntityFromWorld event
    at wdl.WDLHooks.onWorldClientRemoveEntityFromWorld(WDLHooks.java:153)
    at wdl.litemod.LiteModWDL.worldClientRemoveEntityFromWorld(LiteModWDL.java:104)
    at com.mumfrey.liteloader.core.event.EventProxy.$event0000b(EventProxy.java:222)
    at net.minecraft.client.multiplayer.WorldClient.func_73028_b(WorldClient.java)
    at net.minecraft.client.network.NetHandlerPlayClient.func_147238_a(NetHandlerPlayClient.java:588)
    at net.minecraft.network.play.server.S13PacketDestroyEntities.func_148833_a(SourceFile:42)
    at net.minecraft.network.play.server.S13PacketDestroyEntities.func_148833_a(SourceFile:9)
    at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at net.minecraftforge.fml.common.FMLCommonHandler.callFuture(FMLCommonHandler.java:714)
    at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1018)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:345)
    at net.minecraft.client.main.Main.main(SourceFile:120)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
    Minecraft Version: 1.8
    Operating System: Windows 7 (amd64) version 6.1
    Java Version: 1.8.0_25, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 966525152 bytes (921 MB) / 1834483712 bytes (1749 MB) up to 3817865216 bytes (3641 MB)
    JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G
    IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
    FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1491 Optifine OptiFine_1.8_HD_U_D5 31 mods loaded, 31 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
    UCHIJA  mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) 
    UCHIJA  FML{8.0.99.99} [Forge Mod Loader] (forge-1.8-11.14.3.1491.jar) 
    UCHIJA  Forge{11.14.3.1491} [Minecraft Forge] (forge-1.8-11.14.3.1491.jar) 
    UCHIJA  CodeChickenCore{1.0.5.36} [CodeChicken Core] (minecraft.jar) 
    UCHIJA  NotEnoughItems{1.0.5.104} [Not Enough Items] (NotEnoughItems-1.8-1.0.5.104-universal.jar) 
    UCHIJA  PlayerAPI{1.3} [Player API] (minecraft.jar) 
    UCHIJA  RenderPlayerAPI{1.4} [Render Player API] (minecraft.jar) 
    UCHIJA  SmartCore{1.2} [Smart Core] (minecraft.jar) 
    UCHIJA  itemphysic{1.1.2} [ItemPhysic] (minecraft.jar) 
    UCHIJA  SmartMoving{16.1} [Smart Moving] (SmartMoving-1.8-16.1.jar) 
    UCHIJA  DamageIndicatorsMod{3.3.3} [Damage Indicators] ([1.8]DamageIndicatorsMod-3.3.3.jar) 
    UCHIJA  iChunUtil{5.4.0} [iChunUtil] (iChunUtil-5.4.0.jar) 
    UCHIJA  BackTools{5.1.0} [BackTools] (BackTools-5.1.0.jar) 
    UCHIJA  BetterFoliage{1.1.5} [Better Foliage] (BetterFoliage-mc1.8-1.1.5.jar) 
    UCHIJA  DynamicLights{1.3.8} [Dynamic Lights] (DynamicLights-1.8.jar) 
    UCHIJA  DynamicLights_onFire{1.0.4} [Dynamic Lights Burning Entity Module] (DynamicLights-1.8.jar) 
    UCHIJA  DynamicLights_creepers{1.0.4} [Dynamic Lights Creeper Module] (DynamicLights-1.8.jar) 
    UCHIJA  DynamicLights_dropItems{1.0.8} [Dynamic Lights EntityItem Module] (DynamicLights-1.8.jar) 
    UCHIJA  DynamicLights_entityClasses{1.0.1} [Dynamic Lights Entity Light Module] (DynamicLights-1.8.jar) 
    UCHIJA  DynamicLights_mobEquipment{1.0.8} [Dynamic Lights Mob Equipment Light Module] (DynamicLights-1.8.jar) 
    UCHIJA  DynamicLights_flameArrows{1.0.0} [Dynamic Lights Fiery Arrows Light Module] (DynamicLights-1.8.jar) 
    UCHIJA  DynamicLights_floodLights{1.0.2} [Dynamic Lights Flood Light] (DynamicLights-1.8.jar) 
    UCHIJA  DynamicLights_otherPlayers{1.0.7} [Dynamic Lights OtherPlayers Light Module] (DynamicLights-1.8.jar) 
    UCHIJA  DynamicLights_thePlayer{1.1.3} [Dynamic Lights Player Light Module] (DynamicLights-1.8.jar) 
    UCHIJA  inventorytweaks{1.59-176-9318a76-dirty} [Inventory Tweaks] (InventoryTweaks-1.59-176.jar) 
    UCHIJA  pearlmod{0.3.0.16} [Pearlmod] (pearlmod-1.8.0-0.3.1.0.jar) 
    UCHIJA  PixelCam{1.2} [PixelCam] (PixelCam-1.2.jar) 
    UCHIJA  Shatter{5.0.0} [Shatter] (Shatter-5.0.0.jar) 
    UCHIJA  SmartRender{2.1} [Smart Render] (SmartRender-1.8-2.1.jar) 
    UCHIJA  Streak{5.0.1} [Streak] (Streak-5.0.1.jar) 
    UCHIJA  AS_UpdateCheck{1.1.7} [AtomicStryker Update Check Mod] (UpdateCheckerMod-1.8.jar) 
    Loaded coremods (and transformers): 
BetterFoliageLoader (BetterFoliage-mc1.8-1.1.5.jar)
  mods.betterfoliage.loader.impl.BetterFoliageTransformer
FMLPlugin (InventoryTweaks-1.59-176.jar)
  invtweaks.forge.asm.ContainerTransformer
CCLCorePlugin (CodeChickenLib-1.8-1.1.2.133-universal.jar)
  codechicken.lib.asm.ClassHeirachyManager
  codechicken.lib.asm.RenderHookTransformer
SmartCorePlugin (SmartMoving-1.8-16.1.jar)
  net.smart.core.SmartCoreTransformer
PlayerAPIPlugin (PlayerAPI-1.8-1.3.jar)
  api.player.forge.PlayerAPITransformer
CodeChickenCorePlugin (CodeChickenCore-1.8-1.0.5.36-universal.jar)
  codechicken.core.asm.InterfaceDependancyTransformer
  codechicken.core.asm.TweakTransformer
  codechicken.core.asm.DelegatedTransformer
  codechicken.core.asm.DefaultImplementationTransformer
ItemPatchingLoader (ItemPhysic Lite 1.1.3 mc1.8.jar)
  com.creativemd.itemphysic.ItemTransformer
CCCDeobfPlugin (unknown)

RenderPlayerAPIPlugin (RenderPlayerAPI-1.8-1.4.jar)
  api.player.forge.RenderPlayerAPITransformer
DLFMLCorePlugin (DynamicLights-1.8.jar)
  atomicstryker.dynamiclights.common.DLTransformer
NEICorePlugin (NotEnoughItems-1.8-1.0.5.104-universal.jar)
  codechicken.nei.asm.NEITransformer
LoadingPlugin (PixelCam-1.2.jar)
  eu.crushedpixel.pixelcam.coremod.CameraTiltingCT
    GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.5.13397 Compatibility Profile Context 15.200.1046.0' Renderer: 'AMD Radeon R9 200 / HD 7900 Series'

(source)

[Pokechu22]

Fixed in 1.8c-fix1.

(The exact cause was that an entity was removed before WDL's load event, leading WDL.worldClient null when the event occurred. The fix is to use the sender param, which won't be null.)