diff --git a/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkLevelImporter.cs b/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkLevelImporter.cs
index 32beb05a7..67f512fff 100644
--- a/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkLevelImporter.cs
+++ b/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkLevelImporter.cs
@@ -85,7 +85,7 @@ protected override void Import()
             Profiler.EndSample();
             
             Profiler.BeginSample("CacheArtifactsAsset");
-            _projectImporter.TryCacheArtifactsAsset();
+            _projectImporter.TryCacheArtifactsAsset(Logger);
             Profiler.EndSample();
 
             Profiler.BeginSample("CacheDefs");
diff --git a/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkProjectImporter.cs b/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkProjectImporter.cs
index 9e3220075..69d85dd80 100644
--- a/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkProjectImporter.cs
+++ b/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkProjectImporter.cs
@@ -312,12 +312,8 @@ public Sprite GetBackgroundArtifact(Level level)
             Logger.LogError($"Tried retrieving a background from the importer's artifacts, but was null: \"{assetName}\"");
             return asset;
         }
-
-        
         
-        
-
-        public void TryCacheArtifactsAsset()
+        public void TryCacheArtifactsAsset(LDtkDebugInstance logger)
         {
             if (_backgroundArtifacts != null)
             {
@@ -327,7 +323,7 @@ public void TryCacheArtifactsAsset()
             _backgroundArtifacts = AssetDatabase.LoadAssetAtPath<LDtkArtifactAssets>(assetPath);
             if (_backgroundArtifacts == null)
             {
-                Logger.LogError($"Artifacts was null during the import, this should never happen. Does the sub asset not exist for \"{assetPath}\"?");
+                logger.LogError($"Artifacts was null during the import, this should never happen. Does the sub asset not exist for \"{assetPath}\"?");
             }
         }
     }
diff --git a/Assets/LDtkUnity/Runtime/Tools/Bank/LDtkDictionaryUId.cs b/Assets/LDtkUnity/Runtime/Tools/Bank/LDtkDictionaryUId.cs
index 026e61932..35eb385f6 100644
--- a/Assets/LDtkUnity/Runtime/Tools/Bank/LDtkDictionaryUId.cs
+++ b/Assets/LDtkUnity/Runtime/Tools/Bank/LDtkDictionaryUId.cs
@@ -1,4 +1,5 @@
-using System.Linq;
+using System.Collections.Generic;
+using System.Linq;
 
 namespace LDtkUnity
 {
@@ -42,10 +43,23 @@ private void CacheLayerDefs(LayerDefinition[] layerDefs)
         {
             TryAdd(layerDefs);
             
-            IntGridValueGroupDefinition[] groupDefs = layerDefs.SelectMany(p => p.IntGridValuesGroups).ToArray();
-            if (!groupDefs.IsNullOrEmpty())
+            List<IntGridValueGroupDefinition> defs = new List<IntGridValueGroupDefinition>();
+            foreach (LayerDefinition layerDef in layerDefs)
             {
-                TryAdd(groupDefs);
+                //if it's an old json value
+                if (layerDef.IntGridValuesGroups == null)
+                {
+                    continue;
+                }
+                foreach (IntGridValueGroupDefinition group in layerDef.IntGridValuesGroups)
+                {
+                    defs.Add(group);
+                }
+            }
+
+            if (!defs.IsNullOrEmpty())
+            {
+                TryAdd(defs.ToArray());
             }
         }
     }