Fixed bugs

Model/BuildOrders/BuildOrderModel.cs

@@ -94,7 +94,7 @@ public class BuildOrderModel
         return (from ordersAtTime in StartedOrders
             from orders in ordersAtTime.Value
             where ordersAtTime.Key + (orders.Production() == null ? 0 : orders.Production().BuildTime) <= interval
-            where orders.Harvest() != null
+            where orders.Harvester() != null
             select orders).ToList();
     }
 }

Model/Entity/EntityModel.cs

@@ -255,7 +255,7 @@ public class EntityModel
     }
 
 
-    public EntityHarvesterModel Harvest()
+    public EntityHarvesterModel? Harvester()
     {
         return (EntityHarvesterModel)EntityParts.Find(x => x.GetType() == typeof(EntityHarvesterModel))!;
     }

Model/Entity/Parts/IEntityPartInterface.cs

@@ -1,6 +1,9 @@
-namespace Model.Entity.Parts;
+using System.Text.Json.Serialization;
+
+namespace Model.Entity.Parts;
 
 public class IEntityPartInterface
 {
+    [JsonIgnore]
     public EntityModel Parent { get; set; }
 }