flutter: NoSuchMethodError during debugging with breakpoints - flutter

Question

I'm currently playing with flame, a small 2D game engine based on flutter. My code contains a rather strange Heisenbug: It works fine if you start it via run or debug. But if you set a breakpoint, it throws an error
Unhandled exception:
NoSuchMethodError: The getter 'cls' was called on null.
Although I don't think that this is related to flame, I was not able to reproduce the problem with flutter alone. So I'm including a minimal version of my flame-based code. It simply paints the phone-screen with a gray background color:
main.dart:
import 'package:flutter/material.dart';
import 'package:temp/game.dart';
void main(){
MyGame game = MyGame(); // error thrown here
runApp(game.widget);
}
game.dart:
import 'package:flame/game.dart';
import 'dart:ui';
class MyGame extends Game{
Size screenSize;
#override
void render(Canvas canvas) {
Rect screenRect = Rect.fromLTWH(0, 0, screenSize.width, screenSize.height);
Paint screenPaint = Paint();
screenPaint.color = Color.fromARGB(255, 100, 100, 100);
canvas.drawRect(screenRect, screenPaint);
}
#override
void update(double t) {
}
#override
void resize(Size size) {
super.resize(size);
screenSize = size;
}
}
If you want to run this, you also have to add flame to your pubspec:
dependencies:
flutter:
sdk: flutter
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.2
flame: ^0.10.2
My bug happens everytime I set a breakpoint in the render method of MyGame and start debugging.

Answer 1

I can not reproduce this on flame: ^0.22.0 so you can just upgrade to that version and it should work fine.