diff --git a/Source/Editor/Content/Proxy/ModelProxy.cs b/Source/Editor/Content/Proxy/ModelProxy.cs
index 845cbc80b..c78863e5e 100644
--- a/Source/Editor/Content/Proxy/ModelProxy.cs
+++ b/Source/Editor/Content/Proxy/ModelProxy.cs
@@ -87,6 +87,12 @@ namespace FlaxEditor.Content
 
             // Check if asset is streamed enough
             var asset = (Model)request.Asset;
+            var slots = asset.MaterialSlots;
+            foreach (var slot in slots)
+            {
+                if (slot.Material && !slot.Material.IsLoaded)
+                    return false;
+            }
             return asset.LoadedLODs >= Mathf.Max(1, (int)(asset.LODs.Length * ThumbnailsModule.MinimumRequiredResourcesQuality));
         }
 
diff --git a/Source/Editor/Content/Proxy/SkinnedModelProxy.cs b/Source/Editor/Content/Proxy/SkinnedModelProxy.cs
index f0193d0d0..4fd71e933 100644
--- a/Source/Editor/Content/Proxy/SkinnedModelProxy.cs
+++ b/Source/Editor/Content/Proxy/SkinnedModelProxy.cs
@@ -62,6 +62,12 @@ namespace FlaxEditor.Content
             var lods = asset.LODs.Length;
             if (asset.IsLoaded && lods == 0)
                 return true; // Skeleton-only model
+            var slots = asset.MaterialSlots;
+            foreach (var slot in slots)
+            {
+                if (slot.Material && !slot.Material.IsLoaded)
+                    return false;
+            }
             return asset.LoadedLODs >= Mathf.Max(1, (int)(lods * ThumbnailsModule.MinimumRequiredResourcesQuality));
         }