Copied from localvoid/issues/6:

@sebe:

Hi, the dart sdk v1.14.0 returns a Null now instead of empty string, for packageRoot.
I just updated my local copy of standalone.dart to test for null first and it work fine now.
if (packageRoot != null && packageRoot.isNotEmpty && p.startsWith(_packagesPrefix)) {

Next time someone does an update, maybe they could look at this.

api details
++++++++++++
change from
https://api.dartlang.org/1.13.2/dart-io/Platform/packageRoot.html
If there is no --package-root flag, then the empty string is returned.
to
https://api.dartlang.org/1.14.0/dart-io/Platform/packageRoot.html
If there is no --package-root flag, then null is returned.

Error details
+++++++++++++++++
Unhandled exception:
The null object does not have a getter 'isNotEmpty'.

NoSuchMethodError: method not found: 'isNotEmpty'
Receiver: null
Arguments: []

0 Object._noSuchMethod (dart:core-patch/object_patch.dart:42)

1 Object.noSuchMethod (dart:core-patch/object_patch.dart:45)

2 _loadAsBytes (package:timezone/standalone.dart:48:21)

3 initializeTimeZone (package:timezone/standalone.dart:95:10)

4 main (file:///home/pi/time_dart14/main.dart:5:4)

5 _startIsolate. (dart:isolate-patch/isolate_patch.dart:261)

6 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:148)