Questions tagged [null-safety]
96 questions
1
vote
1 answer
the property 'uid' cant be unconditionally accessed because the receiver can be null
i am trying to return value in users where i am getting this error if i am trying to fix this error by adding null sign it does not return any value becuase all this value is going to be null and i want to return this value and save it so i can use…
Amazee21
- 11
- 2
1
vote
4 answers
type 'Null' is not a subtype of type 'String' flutter on api call
Im using a service to create api from xml. This is my model file:
// To parse this JSON data, do
//
// final economylistXml = economylistXmlFromJson(jsonString);
import 'dart:convert';
EconomylistXml economylistXmlFromJson(String str) =>…
Taady
- 2,409
- 2
- 10
- 24
1
vote
2 answers
The body might complete normally, causing 'null' to be returned, but the return type, 'Future', is a potentially non-nullable type
I upgraded my project to null-safety as they describe here dart migrate. I applied all suggestions but I get an error on one of my screens. How can I fix this?
Future systemBackButtonPressed() {
if…
Taady
- 2,409
- 2
- 10
- 24
1
vote
2 answers
Null check operator used on a null value: The relevant error-causing widget was CustomBottomBar
Im new to Flutter. I got this error Null check operator used on a null value error. but I could not solve it. This is the place where the second exception "The relevant error-causing widget was
Consumer" occurs:
@override
Widget…
user13943076
- 21
- 1
- 3
1
vote
2 answers
What is your recommended workflow for Flutter null safety migration tool
I am using the Flutter null safety migration tool.
What is your recommended workflow for null safety migration?
For example:
Start at main.dart first and work your way out from there?
Start with models or classes first?
Start with screens…
Mavrik00
- 15
- 4
1
vote
2 answers
MissingStubError: 'get' when using mockito 5.1.0 to test api using riverpod
I am trying to use mockito to return a fake response in the http.Client call and be able to test the service. I have followed the documentation. It tells me that I should use annotate to generate a fake class, but it seems that the null safe of…
An3Ramirez
- 48
- 7
1
vote
1 answer
I have a problem with Null Safety an the problem is 'Null check operator used on a null value'
It happened when getting some data from firebase and decoding them using model,
and here is the method:
UserModel? userModel;
void getUser() {
emit(GetUserLoadingsState());
FirebaseFirestore.instance.collection('users').doc(uId).get().then((value)…
Alaa Elsweedy
- 23
- 7
1
vote
1 answer
Zero joins with null in the null-safe join
I have noticed that 0 joins with null when using null-safe join (eqNullSafe).
df1 = spark.createDataFrame([(1, ), (None, )], ['df1_id'])
df2 = spark.createDataFrame([(None, ), (0, )], ['df2_id'])
df1.join(df2, df1.df1_id.eqNullSafe(df2.df2_id),…
ZygD
- 22,092
- 39
- 79
- 102
1
vote
1 answer
Error: Expected ',' before this. validator: validate!(String value),
Hello I'm getting this error in flutter:
lib/shared/components/components.dart:41:35: Error: Expected ',' before this.
validator: validate!(String value),
^^^^^
lib/modules/login/login_screen.dart:36:33:…
Diaa Nassar
- 59
- 2
- 7
1
vote
1 answer
How not to print a null value received from sqflite database?
I'm making a "Recipes app" to learn. I have this problem now:
I'm working with Sqflite and I have a page where I show the ingredients from the recipe, the sql query is OK, but the problem is that I'm getting the null values and I don't know what to…
Alain C. Jiménez
- 169
- 1
- 13
1
vote
1 answer
GetX page routing returns "Null check operator used on a null value" error
I am trying to do a very simple page routing with GetX using the latest version of Flutter which includes null safety. It keeps returning the error "Null check operator used on a null value" even when I am passing no arguments or referencing any…
Robyn
- 23
- 4
1
vote
1 answer
flutter "could not generate 'fromJson' code for Type" error on Nullable
I upgraded my project to Null-Safety but I'm getting an error when I define a property as null when running the build_runner:
@JsonKey()
late Guid? colonizedStellarObjectId;
The type Guid is from here, but I modified it to support…
DirtyNative
- 2,553
- 2
- 33
- 58
1
vote
0 answers
"Null check operator used on a null value" shown after signing out
I get the following messages after signing out from firebase on my app.
*Null check operator used on a null value
When the exception was thrown, this was the stack:
#0 MainScreenPage.build..
…
gr_rg
- 25
- 4
1
vote
1 answer
Flutter null safety constructor
I am using flutter's latest(null safety) version and I created a constructor.
This code does not show anything on the screen. Why can't I see icons and text?
import 'package:flutter/material.dart';
import 'input_page.dart';
void main()…
FGY
- 77
- 6
1
vote
0 answers
can not debug with flutter null-safety flutter-dependencies
i can run my app only using
Flutter run --no-sound-null-safety
my mobile attached my my lab top samsung M21
using android studio
flutter version Flutter 2.2.1
dart version Dart 2.13.1
on windows 10
my app it is a template i bought it from…
Hassan Ali Hassan
- 17
- 6