cant display collection data from flutter firestore

Question

I am trying to obtain the data of my documents in a ListView from doc. It tends to receive the data I see an error at doc['title'] stating :

The operator [] isn't defined for the type Object? Function()

Also when I print it I see this :

Closure: () => Map<String, dynamic> from Function 'data':.

StreamBuilder(
    stream: ref.snapshots(),
    builder:(context, AsyncSnapshot<QuerySnapshot> snapshot) {

        if (snapshot.hasError) {
            return Text('Something went wrong');
        }
        if (snapshot.connectionState == ConnectionState.waiting) {
            return CircularProgressIndicator();
        }
        return ListView.builder(itemCount: snapshot.data!.docs.length,
            itemBuilder: (context,index) {
            var doc = snapshot.data!.docs[index].data;
            print(doc);
            return ListTile(
                title: Text('title'),
            );
            }
        );
    }
);