NullReferenceException: Object reference not set to an instance of an object

LootableCorpse.SetUpContainerFromSource (ItemContainer source) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) LootableCorpse.TakeFrom (BaseEntity fromEntity, ItemContainer containerA, ItemContainer containerB, ItemContainer containerC) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) NPCPlayer.CreateCorpse (BasePlayer+PlayerFlags flagsOnDeath, UnityEngine.Vector3 posOnDeath, UnityEngine.Quaternion rotOnDeath, System.Collections.Generic.List`1[T] triggersOnDeath, System.Boolean forceServerSide) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) BasePlayer.OnKilled (HitInfo info) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) ScientistNPC.OnKilled (HitInfo info) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) BaseCombatEntity.Die (HitInfo info) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) BasePlayer.Die (HitInfo info) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) BaseCombatEntity.Hurt (HitInfo info) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) BasePlayer.Hurt (HitInfo info) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) HumanNPC.Hurt (HitInfo info) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) BaseCombatEntity.Hurt (System.Single amount, Rust.DamageType type, BaseEntity attacker, System.Boolean useProtection) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) CH47HelicopterAIController.DismountAllPlayers () (at <b3ca0bc398004404ae88763c49bf1f4e>:0) BaseMountable.DoServerDestroy () (at <b3ca0bc398004404ae88763c49bf1f4e>:0) BaseHelicopter.DoServerDestroy () (at <b3ca0bc398004404ae88763c49bf1f4e>:0) BaseNetworkable.DoEntityDestroy () (at <b3ca0bc398004404ae88763c49bf1f4e>:0) BaseNetworkable.Kill (BaseNetworkable+DestroyMode mode) (at <b3ca0bc398004404ae88763c49bf1f4e>:0) Oxide.Plugins.HeliControl+<>c__DisplayClass115_0.<OnEntitySpawned>b__0 () (at <b3ffd582dcfc4ee89722909cb239c508>:0) InvokeHandlerBase`1[T].DoTick () (at <d520df2e5517482dbc0a74e77a88b92f>:0) InvokeHandlerBase`1[T].LateUpdate () (at <d520df2e5517482dbc0a74e77a88b92f>:0)