Fixing Flutter errors on AWS Amplify: [WARNING] fatal Not a valid object name origin/master

Some time ago I described how to Deploy Flutter project with backend to AWS Amplify.

After flutter team released new version, that method fails with [WARNING]: fatal: Not a valid object name origin/master.

Here I’m describing how to fix this Flutter Error: Not a valid object name origin/master.

Flutter Error on AWS Amplify

The error looks like:

2025-02-22T11:40:59.996Z [INFO]: # Executing command: echo "Installing Flutter SDK"
Installing Flutter SDK
# Executing command: git clone https://github.com/flutter/flutter.git -b stable --depth 1
2025-02-22T11:40:59.997Z [WARNING]: Cloning into 'flutter'...
2025-02-22T11:41:06.271Z [INFO]: # Executing command: export PATH="$PATH:$(pwd)/flutter/bin"
2025-02-22T11:41:06.276Z [INFO]: # Executing command: flutter config --no-analytics
2025-02-22T11:41:06.294Z [WARNING]: fatal: Not a valid object name origin/master
2025-02-22T11:41:06.373Z [ERROR]: !!! Build failed
2025-02-22T11:41:06.373Z [ERROR]: !!! Error: Command failed with exit code 128

Reasons

It’s happening because - Flutter Web fails to build when running on AWS Amplify Hosting Flutter tool fails with shallow clone of repository in 3.29.0+

Fix

In AWS Amplify build config

instead of

git clone https://github.com/flutter/flutter.git -b stable --depth 1

put

git clone https://github.com/flutter/flutter.git -b '3.27.4' --depth 1

It will use previous version of flutter.

Still need to keep an eye on new flutter releases, in hope they fix it.

Useful links

• https://github.com/flutter/flutter/issues/163547
• Deploy Flutter project with backend to AWS Amplify
• [Flutter (Dart) Cheat Sheet](https://www.glukhov.org/post/2022/flutter-dart-cheatsheet/ “Flutter (Dart) Cheatsheet with exampl
• Flutter project with AWS Amplify backend
• Install Flutter
• Dockerising Flutter Web app with dockerised Flutter build and Nginx