Was playing on a modpack with mowzies mods installed, and when I used the mob remover item on any of their mobs, the game crashed.

-SinglePlayer

Steps to reproduce the behavior:

1. Play with Mowzies Mobs
2. Spawn a mob and attempt to delete it with the mob remover
3. The game will crash

Expected Behavior: The mob would be removed

ModList:
Bookshelf (by DarkhaxDev)
Just Enough Items (JEI) (by mezz)
Bayou Blues (Forge) (by team_aurora_modding)
Max Health Fix (by DarkhaxDev)
Easy Magic (by Fuzs_)
In Control! (by McJty)
Sneaky Magic (by Fuzs_)
Savage & Ravage (by TeamAbnormals)
JEITweaker (by Jaredlll08)
ToroHealth Damage Indicators (by ToroCraft)
Upgrade Aquatic (by TeamAbnormals)
AppleSkin (by squeek502)
Property Modifier (by IchHabeHunger54)
Valhelsia Core (by ValhelsiaTeam)
Waystones (by BlayTheNinth)
FastSuite (by Shadows_of_Fire)
Allurement (by TeamAbnormals)
Lootr (by Noobanidus)
Infernal Expansion (by InfernalStudios)
Environmental (by TeamAbnormals)
Better Drowning (by DarkhaxDev)
Citadel (by alex1the1666)
Mowzie's Mobs (by bobmowzie)
SwingThroughGrass (by exidex)
Antique Atlas (by Hunternif)
Guard Villagers (by almightytallestred)
The Endergetic Expansion (by TeamAbnormals)
Fairy Lights (by pau101)
Create (by simibubi)
Dynamic Surroundings (by OreCruncher)
Blame (Forge) (by telepathicgrunt)
TerraForged (by won_ton_)
Mobifier (by Corgi_Taco)
Valhelsia Structures (by ValhelsiaTeam)
Patchouli (by Vazkii)
Relics (by SSKirillSS)
Big Brain (by almightytallestred)
Structure Gel API (by ModdingLegacy)
Morpheus (by Quetzi)
CraftTweaker (by Jaredlll08)
Ensorcellation (by TeamCoFH)
YUNG's Better Caves (Forge) (by YUNGNICKYOUNG)
Repurposed Structures (Forge) (by telepathicgrunt)
Overloaded Armor Bar (by tfarecnim)
Danny's Expansion (by bottomtextdanny)
Antique Waystones (by HorribleNerd)
Supplementaries (by MehVahdJukaar)
Enigmatic Legacy (by Aizistral)
AttributeFix (by DarkhaxDev)
CoFH Core (by TeamCoFH)
Just Enough Resources (JER) (by way2muchnoise)
YUNG's Better Mineshafts (Forge) (by YUNGNICKYOUNG)
CreativeCore (by CreativeMD)
Clumps (by Jaredlll08)
YUNG's Better Strongholds (Forge) (by YUNGNICKYOUNG)
Abnormals Core (by TeamAbnormals)
Curios API (Forge) (by TheIllusiveC4)
YUNG's Extras (Forge) (by YUNGNICKYOUNG)
Dungeons Plus (by ModdingLegacy)
The Conjurer (by ModdingLegacy)
Well-Behaved Mobs (by Fuzs_)
Ice and Fire: Dragons (by alex1the1666)
Alex's Mobs (by alex1the1666)
YUNG's API (Forge) (by YUNGNICKYOUNG)
Mouse Tweaks (by YaLTeR)
Better Burning (by DarkhaxDev)
Ambience - Extras (Music Mod) (by viniciusgf1)
Controlling (by Jaredlll08)
Placebo (by Shadows_of_Fire)
AmbientSounds 3 (by CreativeMD)

Mod Version used: 1.16.5

Relevant FIles:
Latest.log: https://pastebin.com/fZrETgD0
Crash Report: https://pastebin.com/pj4FQfnJ

Not really sure what happened, I asked Bob Mowzie and he said it was a missing null check