null spam fix for hamlet guards

src/engine/mobileAI/MobAI.java

@@ -99,7 +99,10 @@ public class MobAI {
     public static void attackPlayer(Mob mob, PlayerCharacter target) {
 
         try {
-
+            if(target == null || !target.isAlive() || !target.isActive() ) {
+                mob.setCombatTarget(null);
+                return;
+            }
             if (!mob.canSee(target)) {
                 mob.setCombatTarget(null);
                 return;
@@ -121,7 +124,7 @@ public class MobAI {
                 if (mob.isMoving() && mob.getRange() > 20)
                     return;
 
-                CombatManager.combatCycle(mob, mob.combatTarget);
+                CombatManager.combatCycle(mob, target);
             }
 
             if (target.getPet() != null)