NPC owner null check

src/engine/objects/Mob.java

@@ -1393,7 +1393,7 @@ public class Mob extends AbstractIntelligenceAgent {
         NPCManager.applyRuneSetEffects(this);
         this.recalculateStats();
         this.setHealth(this.healthMax);
-        if(this.building == null && ((Mob)this.npcOwner).BehaviourType.ordinal() == MobBehaviourType.GuardCaptain.ordinal()){
+        if(this.building == null && this.npcOwner != null && ((Mob)this.npcOwner).BehaviourType.ordinal() == MobBehaviourType.GuardCaptain.ordinal()){
             this.building = ((Mob)this.npcOwner).building;
         } else if(this.building != null){
             this.region = BuildingManager.GetRegion(this.building, bindLoc.x, bindLoc.y, bindLoc.z);