diff --git a/ProjectLighthouse/Controllers/PublishController.cs b/ProjectLighthouse/Controllers/PublishController.cs
index 134521fa..42ff9ba8 100644
--- a/ProjectLighthouse/Controllers/PublishController.cs
+++ b/ProjectLighthouse/Controllers/PublishController.cs
@@ -1,8 +1,10 @@
 using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
 using System.Xml.Serialization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using ProjectLighthouse.Helpers;
 using ProjectLighthouse.Serialization;
 using ProjectLighthouse.Types;
 
@@ -25,9 +27,12 @@ namespace ProjectLighthouse.Controllers {
             Slot slot = await this.GetSlotFromBody();
             if(slot == null) return this.BadRequest(); // if the level cant be parsed then it obviously cant be uploaded
 
-            string resource = LbpSerializer.StringElement("resource", slot.Resources);
+            string resources = slot.Resources
+                .Where(hash => !FileHelper.ResourceExists(hash))
+                .Aggregate("", (current, hash) => 
+                    current + LbpSerializer.StringElement("resource", hash));
 
-            return this.Ok(LbpSerializer.TaggedStringElement("slot", resource, "type", "user"));
+            return this.Ok(LbpSerializer.TaggedStringElement("slot", resources, "type", "user"));
         }
 
         /// <summary>
diff --git a/ProjectLighthouse/Types/Slot.cs b/ProjectLighthouse/Types/Slot.cs
index 6217c9c3..5dbbf297 100644
--- a/ProjectLighthouse/Types/Slot.cs
+++ b/ProjectLighthouse/Types/Slot.cs
@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
 using System.Xml.Serialization;
 using ProjectLighthouse.Serialization;
 
@@ -83,6 +84,12 @@ namespace ProjectLighthouse.Types {
         [XmlElement("moveRequired")]
         public bool MoveRequired { get; set; }
 
+        public string SerializeResources() {
+            return this.Resources
+                .Aggregate("", (current, resource) => 
+                    current + LbpSerializer.StringElement("resource", resource));
+        }
+
         public string Serialize() {
             string slotData = LbpSerializer.StringElement("name", Name) +
                               LbpSerializer.StringElement("id", SlotId) +
@@ -91,7 +98,7 @@ namespace ProjectLighthouse.Types {
                               LbpSerializer.StringElement("description", Description) +
                               LbpSerializer.StringElement("icon", IconHash) +
                               LbpSerializer.StringElement("rootLevel", RootLevel) +
-                              LbpSerializer.StringElement("resource", this.Resources) +
+                              this.SerializeResources() +
                               LbpSerializer.StringElement("location", Location.Serialize()) +
                               LbpSerializer.StringElement("initiallyLocked", InitiallyLocked) +
                               LbpSerializer.StringElement("isSubLevel", SubLevel) +