I found an issue occurring with the Murmur mob, though this might extend to all mobs consisting of multiple entities, but whenever I try to make the Murmur a follower through the Corail Tombstone mob, the head does not also register as being tamed, and as such begins to attack me. The issue based on what the Exit crash report states is that the Murmur is still trying to attack with a null attack value, thus causing a crash. this issue might also extend towards any mod relating to taming, or controlling mobs. Below is the the full report aside from system details. Apologies if this isn't enough or too much I don't use GitHub often

Exit Code: -1

---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 2023-05-06 13:07:53
Description: Ticking entity

java.lang.NullPointerException: Cannot invoke "net.minecraft.world.entity.LivingEntity.m_20185_()" because "attackTarget" is null
at com.github.alexthe666.alexsmobs.entity.EntityMurmurHead$MoveController.m_8126_(EntityMurmurHead.java:400) ~[alexsmobs-1.21.1.jar%23199!/:1.21.1] {re:classloading}
at net.minecraft.world.entity.Mob.m_6140_(Mob.java:963) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:APP:tombstone.mixins.json:MobMixin,pl:mixin:A}
at net.minecraft.world.entity.LivingEntity.m_8107_(LivingEntity.java:2546) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:caelus.mixins.json:MixinLivingEntity,pl:mixin:APP:curios.mixins.json:MixinLivingEntity,pl:mixin:APP:ecologics-common.mixins.json:LivingEntityMixin,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:tombstone.mixins.json:LivingEntityMixin,pl:mixin:APP:create.mixins.json:CustomItemUseEffectsMixin,pl:mixin:APP:create.mixins.json:accessor.LivingEntityAccessor,pl:mixin:A}
at net.minecraft.world.entity.Mob.m_8107_(Mob.java:645) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:APP:tombstone.mixins.json:MobMixin,pl:mixin:A}
at net.minecraft.world.entity.monster.Monster.m_8107_(Monster.java:42) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,re:classloading,pl:mixin:APP:tombstone.mixins.json:MonsterMixin,pl:mixin:A}
at net.minecraft.world.entity.LivingEntity.m_8119_(LivingEntity.java:2291) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:caelus.mixins.json:MixinLivingEntity,pl:mixin:APP:curios.mixins.json:MixinLivingEntity,pl:mixin:APP:ecologics-common.mixins.json:LivingEntityMixin,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:tombstone.mixins.json:LivingEntityMixin,pl:mixin:APP:create.mixins.json:CustomItemUseEffectsMixin,pl:mixin:APP:create.mixins.json:accessor.LivingEntityAccessor,pl:mixin:A}
at net.minecraft.world.entity.Mob.m_8119_(Mob.java:406) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:APP:tombstone.mixins.json:MobMixin,pl:mixin:A}
at com.github.alexthe666.alexsmobs.entity.EntityMurmurHead.m_8119_(EntityMurmurHead.java:204) ~[alexsmobs-1.21.1.jar%23199!/:1.21.1] {re:classloading}
at net.minecraft.server.level.ServerLevel.m_8647_(ServerLevel.java:658) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:create.mixins.json:accessor.ServerLevelAccessor,pl:mixin:A}
at net.minecraft.world.level.Level.m_46653_(Level.java:457) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:LevelMixin,pl:mixin:A}
at net.minecraft.server.level.ServerLevel.m_184063_(ServerLevel.java:323) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:create.mixins.json:accessor.ServerLevelAccessor,pl:mixin:A}
at net.minecraft.world.level.entity.EntityTickList.m_156910_(EntityTickList.java:54) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:classloading}
at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:303) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:create.mixins.json:accessor.ServerLevelAccessor,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:866) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:806) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.client.server.IntegratedServer.m_5705_(IntegratedServer.java:118) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:classloading,xf:OptiFine:default}
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:654) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:244) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at java.lang.Thread.run(Thread.java:833) [?:?] {}

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

-- Head --
Thread: Server thread
Stacktrace:
at com.github.alexthe666.alexsmobs.entity.EntityMurmurHead$MoveController.m_8126_(EntityMurmurHead.java:400) ~[alexsmobs-1.21.1.jar%23199!/:1.21.1] {re:classloading}
at net.minecraft.world.entity.Mob.m_6140_(Mob.java:963) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:APP:tombstone.mixins.json:MobMixin,pl:mixin:A}
at net.minecraft.world.entity.LivingEntity.m_8107_(LivingEntity.java:2546) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:caelus.mixins.json:MixinLivingEntity,pl:mixin:APP:curios.mixins.json:MixinLivingEntity,pl:mixin:APP:ecologics-common.mixins.json:LivingEntityMixin,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:tombstone.mixins.json:LivingEntityMixin,pl:mixin:APP:create.mixins.json:CustomItemUseEffectsMixin,pl:mixin:APP:create.mixins.json:accessor.LivingEntityAccessor,pl:mixin:A}
at net.minecraft.world.entity.Mob.m_8107_(Mob.java:645) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:APP:tombstone.mixins.json:MobMixin,pl:mixin:A}
at net.minecraft.world.entity.monster.Monster.m_8107_(Monster.java:42) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,re:classloading,pl:mixin:APP:tombstone.mixins.json:MonsterMixin,pl:mixin:A}
at net.minecraft.world.entity.LivingEntity.m_8119_(LivingEntity.java:2291) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:caelus.mixins.json:MixinLivingEntity,pl:mixin:APP:curios.mixins.json:MixinLivingEntity,pl:mixin:APP:ecologics-common.mixins.json:LivingEntityMixin,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:tombstone.mixins.json:LivingEntityMixin,pl:mixin:APP:create.mixins.json:CustomItemUseEffectsMixin,pl:mixin:APP:create.mixins.json:accessor.LivingEntityAccessor,pl:mixin:A}
at net.minecraft.world.entity.Mob.m_8119_(Mob.java:406) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:APP:tombstone.mixins.json:MobMixin,pl:mixin:A}
at com.github.alexthe666.alexsmobs.entity.EntityMurmurHead.m_8119_(EntityMurmurHead.java:204) ~[alexsmobs-1.21.1.jar%23199!/:1.21.1] {re:classloading}
at net.minecraft.server.level.ServerLevel.m_8647_(ServerLevel.java:658) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:create.mixins.json:accessor.ServerLevelAccessor,pl:mixin:A}
at net.minecraft.world.level.Level.m_46653_(Level.java:457) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:LevelMixin,pl:mixin:A}
at net.minecraft.server.level.ServerLevel.m_184063_(ServerLevel.java:323) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:create.mixins.json:accessor.ServerLevelAccessor,pl:mixin:A}
at net.minecraft.world.level.entity.EntityTickList.m_156910_(EntityTickList.java:54) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:classloading}
at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:303) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:create.mixins.json:accessor.ServerLevelAccessor,pl:mixin:A}
-- Entity being ticked --
Details:
Entity Type: alexsmobs:murmur_head (com.github.alexthe666.alexsmobs.entity.EntityMurmurHead)
Entity ID: 338
Entity Name: Murmur
Entity's Exact location: 9.26, 67.63, 88.50
Entity's Block location: World: (9,67,88), Section: (at 9,3,8 in 0,4,5; chunk contains blocks 0,-64,80 to 15,319,95), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,-64,0 to 511,319,511)
Entity's Momentum: 0.04, 0.06, 0.00
Entity's Passengers: []
Entity's Vehicle: null
Stacktrace:
at net.minecraft.world.level.Level.m_46653_(Level.java:457) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:LevelMixin,pl:mixin:A}
at net.minecraft.server.level.ServerLevel.m_184063_(ServerLevel.java:323) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:create.mixins.json:accessor.ServerLevelAccessor,pl:mixin:A}
at net.minecraft.world.level.entity.EntityTickList.m_156910_(EntityTickList.java:54) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:classloading}
at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:303) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:create.mixins.json:accessor.ServerLevelAccessor,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:866) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:806) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.client.server.IntegratedServer.m_5705_(IntegratedServer.java:118) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:classloading,xf:OptiFine:default}
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:654) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:244) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at java.lang.Thread.run(Thread.java:833) [?:?] {}

-- Affected level --
Details:
All players: 1 total; [ServerPlayer['Vedagirl'/588, l='ServerLevel[New World]', x=7.00, y=66.00, z=88.45]]
Chunk stats: 12321
Level dimension: minecraft:overworld
Level spawn location: World: (-16,69,64), Section: (at 0,5,0 in -1,4,4; chunk contains blocks -16,-64,64 to -1,319,79), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,-64,0 to -1,319,511)
Level time: 7710 game time, 7710 day time
Level name: New World
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Level weather: Rain time: 38928 (now: false), thunder time: 125407 (now: false)
Known server brands: forge
Level was modded: true
Level storage version: 0x04ABD - Anvil
Stacktrace:
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:866) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:806) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.client.server.IntegratedServer.m_5705_(IntegratedServer.java:118) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:classloading,xf:OptiFine:default}
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:654) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:244) ~[client-1.19.2-20220805.130853-srg.jar%23243!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at java.lang.Thread.run(Thread.java:833) [?:?] {}

-- System Details --
Details:
Minecraft Version: 1.19.2
Minecraft Version ID: 1.19.2