check player agro map for key before tryign to assign to it

src/engine/objects/AbstractCharacter.java

@@ -1809,7 +1809,13 @@ public abstract class AbstractCharacter extends AbstractWorldObject {
                     //handle hate value addition
                     Mob target = (Mob) this;
                     if (attacker.getObjectType().equals(GameObjectType.PlayerCharacter)) {
+
+                        if(target.playerAgroMap.containsKey(attacker.getObjectUUID()))
                             target.playerAgroMap.put(attacker.getObjectUUID(), target.playerAgroMap.get(attacker.getObjectUUID()) + value);
+                        else
+                            target.playerAgroMap.put(attacker.getObjectUUID(), value);
+
+
                         if (target.isPlayerGuard()) {
                             if (target.guardedCity != null && target.guardedCity.cityOutlaws.contains(attacker.getObjectUUID()) == false)
                                 target.guardedCity.cityOutlaws.add(attacker.getObjectUUID());