Describe the bug
Running windows device. After click LOGIN button, an exception is thrown as below:

flutter: The following ArgumentError was thrown building OverviewView(dirty, dependencies:
flutter: [_LocalizationsScope-[GlobalKey#1ff1c], _ModelBindingScope], state: _OverviewViewState#c9f9f):
flutter: Invalid argument(s): Invalid locale "null"
flutter:
flutter: The relevant error-causing widget was:
flutter: OverviewView
flutter:
lib\…\rally\home.dart:209
flutter:
flutter: When the exception was thrown, this was the stack:
flutter: #0 Intl._throwLocaleError
package:intl/intl.dart:245
flutter: #1 Intl.verifiedLocale
package:intl/intl.dart:239
flutter: #2 new NumberFormat._forPattern
package:intl/…/intl/number_format.dart:505
flutter: #3 new NumberFormat.decimalPercentPattern

To switch channel run:

flutter channel master
flutter upgrade

Flutter doctor
Copy and paste the output of flutter doctor -v here

$ flutter doctor -v
[√] Flutter (Channel master, 1.19.0-3.0.pre.6, on Microsoft Windows [Version 10.0.17763.1158], locale en-US)
• Flutter version 1.19.0-3.0.pre.6 at C:\Users\Te-cheng.hsieh\workspaces\flutter
• Framework revision cd7dfd0a0a (9 hours ago), 2020-06-01 13:58:44 -0700
• Engine revision 923687f0e7
• Dart version 2.9.0 (build 2.9.0-13.0.dev 6489a0c68d)

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
• Android SDK at C:\Users\Te-cheng.hsieh\AppData\Local\Android\sdk
• Platform android-29, build-tools 29.0.3
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
• All Android licenses accepted.

[√] Chrome - develop for the web
• Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop for Windows (Visual Studio Community 2019 16.6.1)
• Visual Studio at C:\Program Files (x86)\Microsoft Visual Studio\2019\Community
• Visual Studio Community 2019 version 16.6.30128.74

[√] Android Studio (version 4.0)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 46.0.2
• Dart plugin version 193.7361
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] VS Code, 64-bit edition (version 1.45.1)
• VS Code at C:\Program Files\Microsoft VS Code
• Flutter extension version 3.11.0

[√] Connected device (3 available)
• Windows • Windows • windows-x64 • Microsoft Windows [Version 10.0.17763.1158]
• Web Server • web-server • web-javascript • Flutter Tools
• Chrome • chrome • web-javascript • Google Chrome 83.0.4103.61

• No issues found!

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Rally
2. Click on LOGIN
3. See error, big red panel with error message: Invalid locale "null"

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Desktop (please complete the following information):

• OS: Windows 10
• Version 10.0.17763.1158

Additional context
Chrome is running ok! Only Windows has issue.