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[tool_crash] Null check operator used on a null value - computeTransitiveDependencies (package:flutter_tools/src/package_graph.dart:76:29) #194444
Description
I had a failure in Dart-Code's E2E tests on GitHub here:
In the logs for the widget preview was the crash below. Unfortunately the URL was truncated in my logs, but hopefully there's enough here to understand what failed.
The full log file from the Dart-Code extension is widgetpreview.txt.
Given the ! in the code is not new, the issue seems intermittent (and happening infrequently), possible some kind of race? This was raised previously at #185272 but was closed due to inability to repro.
cc @bkonyi
Command
flutter widget-preview start --machine --web-server --dtd-url ws://127.0.0.1:36281/xc4KLaryNuQ= --devtools-server-address http://127.0.0.1:9100/Logs
_TypeError: (#0 computeTransitiveDependencies (package:flutter_tools/src/package_graph.dart:76:29))
#0 computeTransitiveDependencies (package:flutter_tools/src/package_graph.dart:76:29)
#1 ManifestAssetBundle.build (package:flutter_tools/src/asset.dart:420:11)
<asynchronous suspension>
#2 ResidentWebRunner._updateDevFS (package:flutter_tools/src/isolated/resident_web_runner.dart:753:26)
<asynchronous suspension>
#3 ResidentWebRunner.run.<anonymous closure> (package:flutter_tools/src/isolated/resident_web_runner.dart:316:41)
<asynchronous suspension>
#4 asyncGuard.<anonymous closure> (package:flutter_tools/src/base/async_guard.dart:108:24)
<asynchronous suspension>[✓] Flutter (Channel master, 3.50.0-1.0.pre-60, on Ubuntu 24.04.5 LTS 6.17.0-1022-azure, locale C.UTF-8) [448ms]
• Flutter version 3.50.0-1.0.pre-60 on channel master at /home/runner/work/E2E-Tests/E2E-Tests/flutter
• Upstream repository https://github.com/flutter/flutter
• Framework revision 8274c72edd (3 hours ago), 2026-10-15 07:58:40 +0000
• Engine revision 8274c72edd
• Dart version 3.15.0<truncated>
Activity
Pass manifestPath to assetBundle in ResidentWebRunner and throw ToolE…