Not able to login with a Google email in Flutter - flutter

Question

I'm trying to login in Flutter and this is the error I'm getting when I try to login with a Google email:
E/flutter (26329): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method '[]' was called on null.
`enter code here`E/flutter (26329): Receiver: null
E/flutter (26329): Tried calling: []("email")
E/flutter (26329): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
E/flutter (26329): #1 DocumentSnapshot.[] (package:cloud_firestore/src/document_snapshot.dart:29:42)
E/flutter (26329): #2 new User.fromDocument (package:buddiesgram/models/user.dart:23:17)
E/flutter (26329): #3 _HomePageState.saveUserInfoFirestore (package:buddiesgram/pages/HomePage.dart:83:26)
E/flutter (26329): <asynchronous suspension>
E/flutter (26329): #4 _HomePageState.controlSignIn (package:buddiesgram/pages/HomePage.dart:54:13)
E/flutter (26329): #5 _HomePageState.initState.<anonymous closure> (package:buddiesgram/pages/HomePage.dart:40:9)
E/flutter (26329): #6 _rootRunUnary (dart:async/zone.dart:1192:38)
E/flutter (26329): #7 _CustomZone.runUnary (dart:async/zone.dart:1085:19)
E/flutter (26329): #8 _CustomZone.runUnaryGuarded (dart:async/zone.dart:987:7)
E/flutter (26329): #9 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter (26329): #10 _DelayedData.perform (dart:async/stream_impl.dart:594:14)
E/flutter (26329): #11 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:710:11)
E/flutter (26329): #12 _PendingEvents.schedule.<anonymous closure> *emphasized text*(dart:async/stream_impl.dart:670:7)
E/flutter (26329): #13 _rootRun (dart:async/zone.dart:1180:38)
E/flutter (26329): #14 _CustomZone.run (dart:async/zone.dart:1077:19)
E/flutter (26329): #15 _CustomZone.runGuarded (dart:async/zone.dart:979:7)
E/flutter (26329): #16 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1019:23)`**`*enter code here*`**`
E/flutter (26329): #17 _rootRun (dart:async/zone.dart:1184:13)
E/flutter (26329): #18 _CustomZone.run (dart:async/zone.dart:1077:19)
E/flutter (26329): #19 _CustomZone.runGuarded (dart:async/zone.dart:979:7)
E/flutter (26329): #20 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1019:23)
E/flutter (26329): #21 _microtaskLoop (dart:async/schedule_microtask.dart:43:21)
E/flutter (26329): #22 _startMicrotaskLoop (dart:async/schedule_microtask.dart:52:5)
E/flutter (26329):
What am I missing?

Answer 1

Please include a code snippet of what you are trying to do
In my understanding of your stackTrace you are trying to call list on a null object like this:
final UserData userData = someObjectHere;
function login(UserData userData){
//The problem is that userData might be null which causes your issue
String email = userData[]("Email");
}
You're solution might be to use null aware operators or to manually check whether the object you're calling a method on is not null.
String email = userData?.[]("Email");
or
if(userData != null) String email = userData?.[]("Email");