Hi My question had nothing to do with the assert, I just wanted to understand the code better since the non-generic version worked and now I understand it better. I don't know if you are interested in testing this but I was thinking that maybe it's the associated type that causes the issues so one alternative to get would be to use MyModelProtocol instead for the generic type func addRecord<T: MyModelProtocol>(_ someDTO: T, recordName: String) async throws { ... }

A crash is exactly that, the app crashes immediately. When an error is thrown the app continues to run and can handle the error