@@ -83,7 +83,7 @@
   List<num> ratio;
 
   /// Array of stack information as [stackId, assetCount] tuples (null for non-stacked assets)
-  Optional<List<List<String>>?> stack;
+  Optional<List<List<String>?>?> stack;
 
   /// Array of BlurHash strings for generating asset previews (base64 encoded)
   List<String> thumbhash;
