example crashes

[sgehrman]

I took a photo, and then got an exception.

The getter 'value' was called on null.
Receiver: null
Tried calling: value

The relevant error-causing widget was
    MaterialApp 
lib/main.dart:20
When the exception was thrown, this was the stack
#0      Object.noSuchMethod  (dart:core-patch/object_patch.dart:53:5)
#1      CircleButton.build 
package:magiceye/…/extra/circle_button.dart:29
#2      StatelessElement.build 
package:flutter/…/widgets/framework.dart:4291
#3      ComponentElement.performRebuild 
package:flutter/…/widgets/framework.dart:4223
#4      Element.rebuild 
package:flutter/…/widgets/framework.dart:3947
...
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by widgets library ═══════════════════════════════════
The getter 'value' was called on null.
Receiver: null
Tried calling: value
The relevant error-causing widget was
    MaterialApp 

calling value on null.

class CircleButton extends StatelessWidget {
final IconData icon;
final void Function() onPressed;
final BehaviorSubject orientationStream;

const CircleButton({
Key key,
@required this.icon,
this.onPressed,
this.orientationStream,
}) : assert(icon != null),
super(key: key);

Widget build(BuildContext context) {
Tuple2<int, int> orientations = Tuple2(0, 0);

return Circle(
  radius: 25,
  child: StreamBuilder<DeviceDirection>(
    initialData: orientationStream.value,    <-- orientationStream is null

[mateusfccp]

Hi, @sgehrman. Thanks for opening this issue.

Could you please send more info about your system, dart and flutter versions? If possible, paste here the results of flutter doctor -v.

I'm going to give it a look by tomorrow.

Thanks, in advance.

[mateusfccp]

@sgehrman I got to reproduce the issue easily.

It was a regression introduced in the last commit (18dee72).

[mateusfccp]

Issue fixed on v0.1.3+1 (87ac5ce).

This regression could be easily be detected if there was flutter component tests, so I'm going to implement it.