bugfix: null combat target

src/engine/gameManager/CombatManager.java

@@ -829,8 +829,14 @@ public enum CombatManager {
                         damage *= 2.5f; //increase damage if sitting
 
                     if (tarAc.getObjectType() == GameObjectType.Mob) {
-                        if(ac.getObjectType().equals(GameObjectType.PlayerCharacter))
+                        if(ac.getObjectType().equals(GameObjectType.PlayerCharacter)) {
-                            ((Mob)tarAc).playerAgroMap.put(ac.getObjectUUID(), ((Mob) tarAc).playerAgroMap.get(ac.getObjectUUID()) + damage);
+                            if(((Mob) tarAc).playerAgroMap.contains(ac.getObjectUUID())) {
+                                ((Mob) tarAc).playerAgroMap.put(ac.getObjectUUID(), ((Mob) tarAc).playerAgroMap.get(ac.getObjectUUID()) + damage);
+                            } else{
+                                ((Mob) tarAc).playerAgroMap.put(ac.getObjectUUID(), damage);
+                            }
+
+                        }
                         ((Mob) tarAc).handleDirectAggro(ac);
                     }