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[Tool] Fix null check operator crash in currentPackageConfig by bkonyi · Pull Request #188454 · flutter/flutter · GitHub
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[Tool] Fix null check operator crash in currentPackageConfig - #188454

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auto-submit[bot] merged 4 commits into
flutter:masterfrom
bkonyi:fix-package-config-null-assertion
Jul 6, 2026
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[Tool] Fix null check operator crash in currentPackageConfig#188454
auto-submit[bot] merged 4 commits into
flutter:masterfrom
bkonyi:fix-package-config-null-assertion

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@bkonyi bkonyi commented Jun 23, 2026 •
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The Flutter tool crashes with a Null check operator used on a null value in sandboxed or package-managed environments (like NixOS or stand-alone AOT runs) where the isolate does not provide package resolution metadata.

This change implements:

  1. Removing the strict null assertion (!) on Isolate.packageConfigSync.

  2. Adding a robust fallback: if null, it attempts to resolve .dart_tool/package_config.json relative to the current working directory and then the executing script.

  3. If all fail, it throws a clean ToolExit prompting the user to run flutter pub get instead of a raw runtime crash.

Fixes #188449

@bkonyi
[Tool] Fix null check operator crash in currentPackageConfig
48c2470 
The Flutter tool crashes with a `Null check operator used on a null value` in sandboxed or package-managed environments (like NixOS or stand-alone AOT runs) where the isolate does not provide package resolution metadata.

This change implements:

1. Removing the strict null assertion (`!`) on `Isolate.packageConfigSync`.

2. Adding a robust fallback: if null, it attempts to resolve `.dart_tool/package_config.json` relative to the current working directory and then the executing script.

3. If all fail, it throws a clean `ToolExit` prompting the user to run `flutter pub get` instead of a raw runtime crash.

Fixes flutter#188449
@flutter-dashboard flutter-dashboard Bot added the CICD Run CI/CD label Jun 23, 2026
@github-actions github-actions Bot added the tool Affects the "flutter" command-line tool. See also t: labels. label Jun 23, 2026
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bkonyi marked this pull request as ready for review June 23, 2026 21:49
@bkonyi
bkonyi changed the base branch from main to master June 23, 2026 21:50
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Code Review

This pull request modifies currentPackageConfig to search the current working directory and script directory for a package configuration file when Isolate.packageConfigSync is null, throwing a ToolExit if none is found. It also adds corresponding unit tests. The review feedback identifies a typo introduced in a TODO comment username.

Comment thread packages/flutter_tools/lib/src/dart/package_map.dart Resolved
@bkonyi bkonyi added CICD Run CI/CD and removed CICD Run CI/CD labels Jun 23, 2026
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An existing Git SHA, 48c247029f6ccce5c919132854801b4f610a5269, was detected, and no actions were taken.

To re-trigger presubmits after closing or re-opeing a PR, or pushing a HEAD commit (i.e. with --force) that already was pushed before, push a blank commit (git commit --allow-empty -m "Trigger Build") or rebase to continue.

@github-actions github-actions Bot removed the CICD Run CI/CD label Jun 23, 2026
@bkonyi bkonyi added the CICD Run CI/CD label Jun 23, 2026
@bkonyi bkonyi added CICD Run CI/CD and removed CICD Run CI/CD labels Jul 6, 2026
@bkonyi
bkonyi requested a review from chingjun July 6, 2026 17:16
@bkonyi bkonyi added the autosubmit Merge PR when tree becomes green via auto submit App label Jul 6, 2026
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auto-submit Bot added this pull request to the merge queue Jul 6, 2026
Merged via the queue into flutter:master with commit ebacc13 Jul 6, 2026
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@flutter-dashboard flutter-dashboard Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Jul 6, 2026
@engine-flutter-autoroll engine-flutter-autoroll mentioned this pull request Jul 7, 2026
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Rusino pushed a commit to Rusino/flutter that referenced this pull request Jul 7, 2026
@bkonyi @Rusino
[Tool] Fix null check operator crash in currentPackageConfig (flutter…
223848a 
…#188454)

The Flutter tool crashes with a `Null check operator used on a null
value` in sandboxed or package-managed environments (like NixOS or
stand-alone AOT runs) where the isolate does not provide package
resolution metadata.

This change implements:

1. Removing the strict null assertion (`!`) on
`Isolate.packageConfigSync`.

2. Adding a robust fallback: if null, it attempts to resolve
`.dart_tool/package_config.json` relative to the current working
directory and then the executing script.

3. If all fail, it throws a clean `ToolExit` prompting the user to run
`flutter pub get` instead of a raw runtime crash.

Fixes flutter#188449
This was referenced Jul 7, 2026
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This was referenced Jul 7, 2026
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auto-submit Bot pushed a commit to flutter/packages that referenced this pull request Jul 8, 2026
@engine-flutter-autoroll
Manual roll Flutter from 6995038d96ef to 91939cc4db78 (48 revisions) (#…
52d84d6 
…12137)

Manual roll Flutter from 6995038d96ef to 91939cc4db78 (48 revisions)

Manual roll requested by stuartmorgan@google.com

flutter/flutter@6995038...91939cc

2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 80ae1deed9ed to 075fbe4778d9 (6 revisions) (flutter/flutter#189067)
2026-07-07 katelovett@google.com Bump customer testing version for new registrants (flutter/flutter#189070)
2026-07-07 engine-flutter-autoroll@skia.org Roll Packages from fc00ceb to 92525f5 (2 revisions) (flutter/flutter#189069)
2026-07-07 47866232+chunhtai@users.noreply.github.com fix android semantics integration test hangs due to postframe callback (flutter/flutter#189043)
2026-07-07 katelovett@google.com Bump goldctl (flutter/flutter#189030)
2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 71db7c06c5fe to 80ae1deed9ed (2 revisions) (flutter/flutter#189060)
2026-07-07 magder@google.com Collect analytics on AI agent usage (flutter/flutter#187630)
2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 125a76cc4cf3 to 71db7c06c5fe (4 revisions) (flutter/flutter#189054)
2026-07-07 engine-flutter-autoroll@skia.org Roll Dart SDK from 70577d6f2bba to c648e3429d76 (1 revision) (flutter/flutter#189052)
2026-07-07 vuhoangminh97@gmail.com Fix RenderSliverPadding setter assertion (flutter/flutter#187353)
2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 2dde156aec3e to 125a76cc4cf3 (3 revisions) (flutter/flutter#189037)
2026-07-07 49402500+fahaddoc@users.noreply.github.com Explain asynchronous causes in the setState() called after dispose() error (flutter/flutter#187294)
2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 7dccd1e79a5b to 2dde156aec3e (2 revisions) (flutter/flutter#189035)
2026-07-07 116356835+AbdeMohlbi@users.noreply.github.com Add `STRING_CATALOG_GENERATE_SYMBOLS = YES;` (flutter/flutter#188163)
2026-07-07 31859944+LongCatIsLooong@users.noreply.github.com Print warnings on Intel Macs / targeting Intel Macs (flutter/flutter#188835)
2026-07-07 engine-flutter-autoroll@skia.org Roll Dart SDK from 4c03f64b19f6 to 70577d6f2bba (1 revision) (flutter/flutter#189031)
2026-07-07 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from n1Lm2Z4DZkfC3bwj5... to 7RjQJBW3m-3Jl-7jr... (flutter/flutter#189032)
2026-07-06 31859944+LongCatIsLooong@users.noreply.github.com Recommend `OverlayPortal.overlayChildLayoutBuilder` over Target-Follower (flutter/flutter#188894)
2026-07-06 154381524+flutteractionsbot@users.noreply.github.com Sync CHANGELOG.md from stable (flutter/flutter#189025)
2026-07-06 matt.kosarek@canonical.com Rename preferredSize to size and preferredConstraints to constraints in the windowing API (flutter/flutter#189017)
2026-07-06 6655696+guidezpl@users.noreply.github.com Skip locked issues in no-response check (flutter/flutter#188950)
2026-07-06 47866232+chunhtai@users.noreply.github.com Fix potential race condtion in android_semantics_integration_test (flutter/flutter#188830)
2026-07-06 codefu@google.com ci: udpate wait-for-engine-build composite action to cocoon (flutter/flutter#189020)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 2b55eed5500d to 7dccd1e79a5b (3 revisions) (flutter/flutter#189021)
2026-07-06 jesswon@google.com [AGP 9] Update Flutter Template Versions (flutter/flutter#188762)
2026-07-06 126701490+richyo-codes@users.noreply.github.com fix(engine/windows): keep tooltip position rect alive - fix use after free (flutter/flutter#188476)
2026-07-06 bkonyi@google.com [Tool] Fix null check operator crash in currentPackageConfig (flutter/flutter#188454)
2026-07-06 bkonyi@google.com [Tool] Gracefully handle WDAC/AppLocker blocks for impellerc (flutter/flutter#188452)
2026-07-06 bkonyi@google.com [flutter_tools] Throw DaemonException if app fails to start early (flutter/flutter#188921)
2026-07-06 engine-flutter-autoroll@skia.org Roll Dart SDK from ce7a2567eb59 to 4c03f64b19f6 (2 revisions) (flutter/flutter#189015)
2026-07-06 bkonyi@google.com [flutter_tools, engine] Add --disable-service-origin-check option to disable VM service origin checks (flutter/flutter#188745)
2026-07-06 bkonyi@google.com [flutter_tools] Fix test flakiness in widget_preview_detection_test.dart (flutter/flutter#188922)
2026-07-06 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#189009)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from c0e2b9667d91 to 2b55eed5500d (1 revision) (flutter/flutter#189006)
2026-07-06 engine-flutter-autoroll@skia.org Roll Packages from 2fbe873 to fc00ceb (1 revision) (flutter/flutter#189007)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from b68567542f81 to c0e2b9667d91 (1 revision) (flutter/flutter#189004)
2026-07-06 Rusino@users.noreply.github.com Fixing multiline GetBoxesForRange (flutter/flutter#188803)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from e15ea7a4b927 to b68567542f81 (4 revisions) (flutter/flutter#189000)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 79806692425f to e15ea7a4b927 (2 revisions) (flutter/flutter#188992)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 2826ae6dc649 to 79806692425f (1 revision) (flutter/flutter#188991)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 7f99eee20fd6 to 2826ae6dc649 (1 revision) (flutter/flutter#188990)
2026-07-06 737941+loic-sharma@users.noreply.github.com Add debugPaintFocusBoxes (flutter/flutter#188288)
2026-07-05 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from bkK6BLiZDRnE7AQQj... to n1Lm2Z4DZkfC3bwj5... (flutter/flutter#188989)
2026-07-05 engine-flutter-autoroll@skia.org Roll Skia from 75a4bf6706bd to 7f99eee20fd6 (2 revisions) (flutter/flutter#188988)
...
kalyujniy pushed a commit to brickit-app/camera that referenced this pull request Jul 8, 2026
@engine-flutter-autoroll @kalyujniy
Manual roll Flutter from 6995038d96ef to 91939cc4db78 (48 revisions) (f…
0897332 
…lutter#12137)

Manual roll Flutter from 6995038d96ef to 91939cc4db78 (48 revisions)

Manual roll requested by stuartmorgan@google.com

flutter/flutter@6995038...91939cc

2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 80ae1deed9ed to 075fbe4778d9 (6 revisions) (flutter/flutter#189067)
2026-07-07 katelovett@google.com Bump customer testing version for new registrants (flutter/flutter#189070)
2026-07-07 engine-flutter-autoroll@skia.org Roll Packages from fc00ceb to 92525f5 (2 revisions) (flutter/flutter#189069)
2026-07-07 47866232+chunhtai@users.noreply.github.com fix android semantics integration test hangs due to postframe callback (flutter/flutter#189043)
2026-07-07 katelovett@google.com Bump goldctl (flutter/flutter#189030)
2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 71db7c06c5fe to 80ae1deed9ed (2 revisions) (flutter/flutter#189060)
2026-07-07 magder@google.com Collect analytics on AI agent usage (flutter/flutter#187630)
2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 125a76cc4cf3 to 71db7c06c5fe (4 revisions) (flutter/flutter#189054)
2026-07-07 engine-flutter-autoroll@skia.org Roll Dart SDK from 70577d6f2bba to c648e3429d76 (1 revision) (flutter/flutter#189052)
2026-07-07 vuhoangminh97@gmail.com Fix RenderSliverPadding setter assertion (flutter/flutter#187353)
2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 2dde156aec3e to 125a76cc4cf3 (3 revisions) (flutter/flutter#189037)
2026-07-07 49402500+fahaddoc@users.noreply.github.com Explain asynchronous causes in the setState() called after dispose() error (flutter/flutter#187294)
2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 7dccd1e79a5b to 2dde156aec3e (2 revisions) (flutter/flutter#189035)
2026-07-07 116356835+AbdeMohlbi@users.noreply.github.com Add `STRING_CATALOG_GENERATE_SYMBOLS = YES;` (flutter/flutter#188163)
2026-07-07 31859944+LongCatIsLooong@users.noreply.github.com Print warnings on Intel Macs / targeting Intel Macs (flutter/flutter#188835)
2026-07-07 engine-flutter-autoroll@skia.org Roll Dart SDK from 4c03f64b19f6 to 70577d6f2bba (1 revision) (flutter/flutter#189031)
2026-07-07 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from n1Lm2Z4DZkfC3bwj5... to 7RjQJBW3m-3Jl-7jr... (flutter/flutter#189032)
2026-07-06 31859944+LongCatIsLooong@users.noreply.github.com Recommend `OverlayPortal.overlayChildLayoutBuilder` over Target-Follower (flutter/flutter#188894)
2026-07-06 154381524+flutteractionsbot@users.noreply.github.com Sync CHANGELOG.md from stable (flutter/flutter#189025)
2026-07-06 matt.kosarek@canonical.com Rename preferredSize to size and preferredConstraints to constraints in the windowing API (flutter/flutter#189017)
2026-07-06 6655696+guidezpl@users.noreply.github.com Skip locked issues in no-response check (flutter/flutter#188950)
2026-07-06 47866232+chunhtai@users.noreply.github.com Fix potential race condtion in android_semantics_integration_test (flutter/flutter#188830)
2026-07-06 codefu@google.com ci: udpate wait-for-engine-build composite action to cocoon (flutter/flutter#189020)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 2b55eed5500d to 7dccd1e79a5b (3 revisions) (flutter/flutter#189021)
2026-07-06 jesswon@google.com [AGP 9] Update Flutter Template Versions (flutter/flutter#188762)
2026-07-06 126701490+richyo-codes@users.noreply.github.com fix(engine/windows): keep tooltip position rect alive - fix use after free (flutter/flutter#188476)
2026-07-06 bkonyi@google.com [Tool] Fix null check operator crash in currentPackageConfig (flutter/flutter#188454)
2026-07-06 bkonyi@google.com [Tool] Gracefully handle WDAC/AppLocker blocks for impellerc (flutter/flutter#188452)
2026-07-06 bkonyi@google.com [flutter_tools] Throw DaemonException if app fails to start early (flutter/flutter#188921)
2026-07-06 engine-flutter-autoroll@skia.org Roll Dart SDK from ce7a2567eb59 to 4c03f64b19f6 (2 revisions) (flutter/flutter#189015)
2026-07-06 bkonyi@google.com [flutter_tools, engine] Add --disable-service-origin-check option to disable VM service origin checks (flutter/flutter#188745)
2026-07-06 bkonyi@google.com [flutter_tools] Fix test flakiness in widget_preview_detection_test.dart (flutter/flutter#188922)
2026-07-06 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#189009)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from c0e2b9667d91 to 2b55eed5500d (1 revision) (flutter/flutter#189006)
2026-07-06 engine-flutter-autoroll@skia.org Roll Packages from 2fbe873 to fc00ceb (1 revision) (flutter/flutter#189007)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from b68567542f81 to c0e2b9667d91 (1 revision) (flutter/flutter#189004)
2026-07-06 Rusino@users.noreply.github.com Fixing multiline GetBoxesForRange (flutter/flutter#188803)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from e15ea7a4b927 to b68567542f81 (4 revisions) (flutter/flutter#189000)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 79806692425f to e15ea7a4b927 (2 revisions) (flutter/flutter#188992)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 2826ae6dc649 to 79806692425f (1 revision) (flutter/flutter#188991)
2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 7f99eee20fd6 to 2826ae6dc649 (1 revision) (flutter/flutter#188990)
2026-07-06 737941+loic-sharma@users.noreply.github.com Add debugPaintFocusBoxes (flutter/flutter#188288)
2026-07-05 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from bkK6BLiZDRnE7AQQj... to n1Lm2Z4DZkfC3bwj5... (flutter/flutter#188989)
2026-07-05 engine-flutter-autoroll@skia.org Roll Skia from 75a4bf6706bd to 7f99eee20fd6 (2 revisions) (flutter/flutter#188988)
...
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@chingjun chingjun chingjun approved these changes
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[Tool] Unconditional Null Assertion on Isolate.packageConfigSync

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