Ignore null

Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterImpl.cs

@@ -38,6 +38,7 @@ namespace UniGLTF
 
             // 2 回目以降の Asset Import において、 Importer の設定で Extract した UnityEngine.Object が入る
             var extractedObjects = scriptedImporter.GetExternalObjectMap()
+                .Where(x => x.Value != null)
                 .ToDictionary(kv => new SubAssetKey(kv.Value.GetType(), kv.Value.name), kv => kv.Value);
 
             using (var loader = new ImporterContext(parser, extractedObjects))

Assets/VRM/Editor/Format/VRMImporterMenu.cs

@@ -78,6 +78,7 @@ namespace VRM
                 //
                 var map = texturePaths
                     .Select(x => x.LoadAsset<Texture2D>())
+                    .Where(x => x != null)
                     .ToDictionary(x => new SubAssetKey(x), x => x as Object);
 
                 using (var context = new VRMImporterContext(parser, map))