(11:09:52) | System.NullReferenceException: Object reference not set to an instance of an object
at BaseProjectile.ServerUse (System.Single damageModifier, UnityEngine.Transform originOverride) [0x000e3] in <3396d8aa8f77468f94ec13cc51800de6>:0
at NPCPlayer.ShotTest (System.Single targetDist) [0x000f7] in <3396d8aa8f77468f94ec13cc51800de6>:0
at ScientistNPC.ShotTest (System.Single targetDist) [0x00000] in <3396d8aa8f77468f94ec13cc51800de6>:0
at HumanNPC.TickAttack (System.Single delta, BaseCombatEntity target, System.Boolean targetIsLOS) [0x00106] in <3396d8aa8f77468f94ec13cc51800de6>:0
at HumanNPC.AttackTick (System.Single delta, BaseEntity target, System.Boolean targetIsLOS) [0x00007] in <3396d8aa8f77468f94ec13cc51800de6>:0
at AttackTickAIEvent.Execute (AIMemory memory, AIBrainSenses senses, StateStatus stateStatus) [0x00042] in <3396d8aa8f77468f94ec13cc51800de6>:0
at AIEvents.Tick (System.Single deltaTime, StateStatus stateStatus) [0x000c3] in <3396d8aa8f77468f94ec13cc51800de6>:0
at BaseAIBrain`1[T].Think (System.Single delta) [0x0007e] in <3396d8aa8f77468f94ec13cc51800de6>:0
at BaseAIBrain`1[T].DoThink () [0x0000d] in <3396d8aa8f77468f94ec13cc51800de6>:0
at HumanNPC.ServerThink (System.Single delta) [0x0001a] in <3396d8aa8f77468f94ec13cc51800de6>:0
at NPCPlayer.ServerThink_Internal () [0x0000d] in <3396d8aa8f77468f94ec13cc51800de6>:0
at HumanNPC.TryThink () [0x00000] in <3396d8aa8f77468f94ec13cc51800de6>:0
at AIThinkManager.DoProcessing (ListHashSet`1[T] process, System.Single budgetSeconds, System.Int32& last) [0x00014] in <3396d8aa8f77468f94ec13cc51800de6>:0
after some time we are noticing the NPC are no longer riding horses and feel like this error is popping up but can not confirm that.