I copied and pasted the documentation from Firestore:

private func getMultipleAll() async {
   // [START get_multiple_all]
   do {
       let querySnapshot = try await self.db.collection("cities").getDocuments()
     for document in querySnapshot.documents {
       print("(document.documentID) => (document.data())")
     }
   } catch {
     print("Error getting documents: (error)")
   }
   // [END get_multiple_all]
 }

Here’s the link: https://firebase.google.com/docs/firestore/query-data/get-data?hl=en&authuser=0

Every time I try to run this it crashes and goes to the App Delegate. It’s copied and pasted from google. Any help?