.contains check needed.

src/engine/gameManager/CombatManager.java

@@ -1325,7 +1325,8 @@ public enum CombatManager {
 
                 // Add to city outlaw list
 
-                if (attacker.getObjectType().equals(GameObjectType.PlayerCharacter))
+                if (attacker.getObjectType().equals(GameObjectType.PlayerCharacter) &&
+                        attackedMobile.guardedCity.cityOutlaws.contains(attacker.getObjectUUID()) == false)
                     attackedMobile.guardedCity.cityOutlaws.add(attacker.getObjectUUID());
 
             }