After updating server this is occuring on server boot. Fatal error in gc. Too many heap sections

What makes you think its HumanNPC plugin?

Any idea what's causing this in the logs ?

23/10 16:35:47 | System.NullReferenceException: Object reference not set to an instance of an object
at BaseProjectile.ServerUse (System.Single damageModifier, UnityEngine.Transform originOverride) [0x000e3] in <2f3701e8532240ff972e47cc839b22e2>:0
at NPCPlayer.ShotTest (System.Single targetDist) [0x000f7] in <2f3701e8532240ff972e47cc839b22e2>:0
at ScientistNPC.ShotTest (System.Single targetDist) [0x00000] in <2f3701e8532240ff972e47cc839b22e2>:0
at HumanNPC.TickAttack (System.Single delta, BaseCombatEntity target, System.Boolean targetIsLOS) [0x00106] in <2f3701e8532240ff972e47cc839b22e2>:0
at HumanNPC.AttackTick (System.Single delta, BaseEntity target, System.Boolean targetIsLOS) [0x00007] in <2f3701e8532240ff972e47cc839b22e2>:0
at AttackTickAIEvent.Execute (AIMemory memory, AIBrainSenses senses, StateStatus stateStatus) [0x00042] in <2f3701e8532240ff972e47cc839b22e2>:0
at AIEvents.Tick (System.Single deltaTime, StateStatus stateStatus) [0x000c3] in <2f3701e8532240ff972e47cc839b22e2>:0
at BaseAIBrain.Think (System.Single delta) [0x00085] in <2f3701e8532240ff972e47cc839b22e2>:0
at BaseAIBrain.DoThink () [0x0000d] in <2f3701e8532240ff972e47cc839b22e2>:0
at HumanNPC.ServerThink (System.Single delta) [0x0001a] in <2f3701e8532240ff972e47cc839b22e2>:0
at NPCPlayer.ServerThink_Internal () [0x0000d] in <2f3701e8532240ff972e47cc839b22e2>:0
at HumanNPC.TryThink () [0x00000] in <2f3701e8532240ff972e47cc839b22e2>:0
at AIThinkManager.DoProcessing (ListHashSet`1[T] process, System.Single budgetSeconds, System.Int32& last) [0x00014] in <2f3701e8532240ff972e47cc839b22e2>:0

Thats not HumanNPC thats rusts Defailt  ScientistNPC as stated in the error 
at ScientistNPC.ShotTest (System.Single targetDist) [0x00000] in <2f3701e8532240ff972e47cc839b22e2>:0
at NPCPlayer.ServerThink_Internal () [0x0000d] in <2f3701e8532240ff972e47cc839b22e2>:0

Thanks for the clarification.

Delete not needed