The asset lib version is old. It will always be old. Godot AssetLib is not a good platform for automating updates. It says as much in the AssetLib listing.
If you can find a legal homebrew ROM that can replicate this error, I will look into it. But I cannot spend time on a fix for an ripped cartridge ROM, even if it’s for personal use copied from a legit cartage that you own. This emulator is intended for publishing homebrew games on modern hardware.
I suspect that game doesn’t quite follow the spec and that’s what’s causing this error. I would be curious to see if it causes other emulators to crash. Regardless, investing that is outside of the scope of this project. Sorry.