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Minecraft version: 1.12.2]
Wizardry version: 4.1.4
Environment: Singleplayer

Issue details: Died to a mob in a dungeon and when I clicked re-spawn (of which my bed was very close) the game crashed throwing up this error. Since then upon loading in the game will continually crash upon loading.

Other mods involved: Special Mobs https://www.curseforge.com/minecraft/mc-mods/special-mobs

---- Minecraft Crash Report ----

WARNING: coremods are present:
OpenEyePlugin (OpenEye-1.12.2-0.8.jar)
CorePlugin (ForgeEndertech-1.12.2-4.4.22.1-build.0389.jar)
CTMCorePlugin (CTM-MC1.12.2-0.3.3.22.jar)
LoadingPlugin (Bloodmoon-MC1.12.2-1.5.3.jar)
p455w0rdc0re (p455w0rdslib-1.12.2-2.2.156.jar)
Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
LoadingPlugin (AdPother-1.12.2-1.0.21.1-build.0389.jar)
CoreMod (TickProfiler-1.12-0.0.7.jar)
IvToolkit (IvToolkit-1.3.3-1.12.jar)
LogisticsPipesCoreLoader (logisticspipes-0.10.2.203.jar)
CoreMod (Aroma1997Core-1.12.2-2.0.0.2.jar)
DynamicSurroundingsCore (DynamicSurroundings-core-1.12.2-3.5.4.3.jar)
CharmLoadingPlugin (Charm-1.12.2-1.2.2.jar)
Quark Plugin (Quark-r1.5-168.jar)
RBLoadingPlugin (RealBench-1.12.2-1.3.3.jar)
Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.5-1.12.2.jar)
OpenModsCorePlugin (OpenModsLib-1.12.2-0.12.2.jar)
RandomPatches (randompatches-1.12.2-1.17.2.1.jar)
EnderCorePlugin (EnderCore-1.12.2-0.5.59-core.jar)
NWRTweak (redstonepaste-mc1.12-1.7.5.jar)
LoadingPlugin (AdChimneys-1.12.2-3.5.4.0-build.0384.jar)
ForgelinPlugin (Forgelin-1.8.3.jar)
llibrary (llibrary-core-1.0.11-1.12.2.jar)
IELoadingPlugin (ImmersiveEngineering-core-0.12-89.jar)
MekanismCoremod (Mekanism-1.12.2-9.8.0.381.jar)
SSLoadingPlugin (SereneSeasons-1.12.2-1.2.16-universal.jar)
BetterFoliageLoader (BetterFoliage-MC1.12-2.2.0.jar)
Contact their authors BEFORE contacting forge

// Uh... Did I do that?

Time: 7/29/19 2:35 AM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at electroblob.wizardry.item.IConjuredItem.onLivingDropsEvent(IConjuredItem.java:49)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_603_IConjuredItem_onLivingDropsEvent_LivingDropsEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraft.entity.player.EntityPlayerMP.func_70645_a(EntityPlayerMP.java:510)
at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:1023)
at net.minecraft.entity.player.EntityPlayer.func_70097_a(EntityPlayer.java:1038)
at net.minecraft.entity.player.EntityPlayerMP.func_70097_a(EntityPlayerMP.java:645)
at net.minecraft.entity.monster.EntityMob.func_70652_k(EntityMob.java:99)
at net.minecraft.entity.monster.EntityCaveSpider.func_70652_k(SourceFile:38)
at fathertoast.specialmobs.entity.cavespider.Entity_SpecialCaveSpider.func_70652_k(Entity_SpecialCaveSpider.java:153)
at net.minecraft.entity.ai.EntityAIAttackMelee.func_190102_a(EntityAIAttackMelee.java:178)
at net.minecraft.entity.ai.EntityAIAttackMelee.func_75246_d(EntityAIAttackMelee.java:167)
at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:129)
at net.minecraft.entity.EntityLiving.func_70626_be(EntityLiving.java:888)
at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:2359)
at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:678)
at net.minecraft.entity.monster.EntityMob.func_70636_d(EntityMob.java:45)
at fathertoast.specialmobs.entity.cavespider.Entity_SpecialCaveSpider.func_70636_d(Entity_SpecialCaveSpider.java:144)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2179)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:377)
at net.minecraft.entity.monster.EntityMob.func_70071_h_(EntityMob.java:50)
at net.minecraft.entity.monster.EntitySpider.func_70071_h_(EntitySpider.java:85)
at net.minecraft.world.World.func_72866_a(World.java:1993)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:832)
at net.minecraft.world.World.func_72870_g(World.java:1955)
at net.minecraft.world.World.func_72939_s(World.java:1759)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:613)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:767)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:252)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Thread.java:745)

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

-- Head --
Thread: Server thread
Stacktrace:
at electroblob.wizardry.item.IConjuredItem.onLivingDropsEvent(IConjuredItem.java:49)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_603_IConjuredItem_onLivingDropsEvent_LivingDropsEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraft.entity.player.EntityPlayerMP.func_70645_a(EntityPlayerMP.java:510)
at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:1023)
at net.minecraft.entity.player.EntityPlayer.func_70097_a(EntityPlayer.java:1038)
at net.minecraft.entity.player.EntityPlayerMP.func_70097_a(EntityPlayerMP.java:645)
at net.minecraft.entity.monster.EntityMob.func_70652_k(EntityMob.java:99)
at net.minecraft.entity.monster.EntityCaveSpider.func_70652_k(SourceFile:38)
at fathertoast.specialmobs.entity.cavespider.Entity_SpecialCaveSpider.func_70652_k(Entity_SpecialCaveSpider.java:153)
at net.minecraft.entity.ai.EntityAIAttackMelee.func_190102_a(EntityAIAttackMelee.java:178)
at net.minecraft.entity.ai.EntityAIAttackMelee.func_75246_d(EntityAIAttackMelee.java:167)
at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:129)
at net.minecraft.entity.EntityLiving.func_70626_be(EntityLiving.java:888)
at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:2359)
at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:678)
at net.minecraft.entity.monster.EntityMob.func_70636_d(EntityMob.java:45)
at fathertoast.specialmobs.entity.cavespider.Entity_SpecialCaveSpider.func_70636_d(Entity_SpecialCaveSpider.java:144)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2179)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:377)
at net.minecraft.entity.monster.EntityMob.func_70071_h_(EntityMob.java:50)
at net.minecraft.entity.monster.EntitySpider.func_70071_h_(EntitySpider.java:85)
at net.minecraft.world.World.func_72866_a(World.java:1993)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:832)
at net.minecraft.world.World.func_72870_g(World.java:1955)

-- Entity being ticked --
Details:
Entity Type: specialmobs:specialcavespider (fathertoast.specialmobs.entity.cavespider.Entity_SpecialCaveSpider)
Entity ID: 436869
Entity Name: Cave Spider
Entity's Exact location: -2508.99, 46.00, -3665.57
Entity's Block location: World: (-2509,46,-3666), Chunk: (at 3,2,14 in -157,-230; contains blocks -2512,0,-3680 to -2497,255,-3665), Region: (-5,-8; contains chunks -160,-256 to -129,-225, blocks -2560,0,-4096 to -2049,255,-3585)
Entity's Momentum: 0.00, -0.08, -0.07
Entity's Passengers: []
Entity's Vehicle: ERROR NullPointerException: null
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1759)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:613)

-- Affected level --
Details:
Level name: Testing
All players: 1 total; [EntityPlayerMP['StormbringerGTX'/387573, l='Testing', x=-2508.30, y=46.00, z=-3665.70]]
Chunk stats: ServerChunkCache: 1514 Drop: 0
Level seed: -1817577923448677370
Level generator: ID 06 - BIOMESOP, ver 0. Features enabled: true
Level generator options: {"landScheme":"vanilla","tempScheme":"random","rainScheme":"random","biomeSize":"medium","amplitude":1.0,"generateBopOre":true,"generatePoisonIvy":false,"generateBerryBushes":true,"generateThorns":true,"generateQuicksand":true,"generateLiquidPoison":true,"generateHotSprings":true,"generateNetherHives":true,"generateEndFeatures":true,"mainNoiseScaleX":80.0,"mainNoiseScaleY":160.0,"mainNoiseScaleZ":80.0,"coordinateScale":684.412,"heightScale":684.412,"upperLimitScale":512.0,"lowerLimitScale":512.0}
Level spawn location: World: (177,64,258), Chunk: (at 1,4,2 in 11,16; contains blocks 176,0,256 to 191,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 103432 game time, 144406 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 129960 (now: false), thunder time: 17675 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:767)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:252)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 2310189744 bytes (2203 MB) / 6442450944 bytes (6144 MB) up to 6442450944 bytes (6144 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx6G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
IntCache: cache: 0, tcache: 0, allocated: 5, tallocated: 104
FML: MCP 9.42 Powered by Forge 14.23.5.2838 Optifine OptiFine_1.12.2_HD_U_E3 223 mods loaded, 223 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

Looks like the special mobs cave spider has attempted to drop an invalid item. Unfortunately, it's not open-source so there's not much I can find out beyond that. Mobs should not be dropping null EntityItems, nor should any ItemStack be null.

Anyway I can help you with more info? Wasn't even sure if your mod was the core issue, or to be a side effect of special mobs doing something funky.

Oh it's easy enough to protect against the crash in wizardry's code, but as far as I can tell it's an issue on special mobs' end so it may be worth posting it there too.

Will do, thanks for the heads up!