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[ Widget Preview ] Crashes when flutter config --no-enable-web is set #178486
Description
If a user has set flutter config --no-enable-web, the widget previewer will crash on launch with one of the two following errors:
flutter widget-preview start:
Error: Failed to locate browser. Make sure you are using an up-to-date Chrome or Edge. Otherwise, consider running with --web-server instead.
flutter widget-preview start --web-server:
StateError: Bad state: No element
#0 List.single (dart:core-patch/growable_array.dart:362:22)
#1 WidgetPreviewStartCommand.runPreviewEnvironment (package:flutter_tools/src/commands/widget_preview.dart:404:26)
<asynchronous suspension>
#2 WidgetPreviewStartCommand.runCommand (package:flutter_tools/src/commands/widget_preview.dart:344:24)
<asynchronous suspension>
#3 FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1559:27)
<asynchronous suspension>
#4 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
<asynchronous suspension>
#5 CommandRunner.runCommand (package:args/command_runner.dart:212:13)
<asynchronous suspension>
#6 FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:487:9)
<asynchronous suspension>
#7 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
<asynchronous suspension>
#8 FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:422:5)
<asynchronous suspension>
#9 run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:101:11)
<asynchronous suspension>
#10 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
<asynchronous suspension>
#11 main (package:flutter_tools/executable.dart:103:3)
<asynchronous suspension>
Activity
[ Widget Preview ] Throw `ToolExit` if Flutter Web is not enabled
[ Widget Preview ] Throw `ToolExit` if Flutter Web is not enabled (#1…
[ Widget Preview ] Throw `ToolExit` if Flutter Web is not enabled (fl…
[ Widget Preview ] Throw `ToolExit` if Flutter Web is not enabled (fl…
[CP-stable][ Widget Preview ] Throw `ToolExit` if Flutter Web is not …
[CP-beta][ Widget Preview ] Throw `ToolExit` if Flutter Web is not en…
[ Widget Preview ] Throw `ToolExit` if Flutter Web is not enabled (fl…
github-actions commentedon Nov 28, 2025
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.[ Widget Preview ] Throw `ToolExit` if Flutter Web is not enabled (fl…
[ Widget Preview ] Throw `ToolExit` if Flutter Web is not enabled (fl…
[ Widget Preview ] Throw `ToolExit` if Flutter Web is not enabled (#1…