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_CastError: Null check operator used on a null value at MaterialFonts.updateInner(flutter_cache.dart:141) #90092

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#191494
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_CastError: Null check operator used on a null value at MaterialFonts.updateInner(flutter_cache.dart:141)#90092
#191494
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P2Important issues not at the top of the work listc: crashStack traces logged to the consoleteam-toolOwned by Flutter Tool teamtoolAffects the "flutter" command-line tool. See also t: labels.tool-still-validIssues that have been deemed still valid as part of the Flutter Tools issue cleanup initiative.triaged-toolTriaged by Flutter Tool team

Description

@jmagman
jmagman
opened on Sep 15, 2021

Number 6 crasher on Flutter 2.5

Thread 0 main thread_CastError: Null check operator used on a null value
at MaterialFonts.updateInner(flutter_cache.dart:141)
at CachedArtifact.update(cache.dart:688)
at Cache.updateAll(cache.dart:557)
at <asynchronous gap>(async)
at FlutterCommand.verifyThenRunCommand(flutter_command.dart:1228)
at <asynchronous gap>(async)
at FlutterCommand.run.<anonymous closure>(flutter_command.dart:1125)
at <asynchronous gap>(async)
at AppContext.run.<anonymous closure>(context.dart:150)
at <asynchronous gap>(async)
at CommandRunner.runCommand(command_runner.dart:209)
at <asynchronous gap>(async)
at FlutterCommandRunner.runCommand.<anonymous closure>(flutter_command_runner.dart:288)
at <asynchronous gap>(async)
at AppContext.run.<anonymous closure>(context.dart:150)
at <asynchronous gap>(async)
at FlutterCommandRunner.runCommand(flutter_command_runner.dart:236)
at <asynchronous gap>(async)
at run.<anonymous closure>.<anonymous closure>(runner.dart:62)
at <asynchronous gap>(async)
at AppContext.run.<anonymous closure>(context.dart:150)
at <asynchronous gap>(async)
at main(executable.dart:92)
at <asynchronous gap>(async)

flutter/packages/flutter_tools/lib/src/flutter_cache.dart

Line 141 in 4cc385b

final Uri archiveUri = _toStorageUri(version!);

Caused by #85242 (comment)

I think the right thing to do is ! so if it does fail it shows up in crash logging

Activity

  1. jmagman
    added
    c: crashStack traces logged to the console
    toolAffects the "flutter" command-line tool. See also t: labels.
    on Sep 15, 2021
  2. jmagman
    changed the title [-]thread_CastError: Null check operator used on a null value at MaterialFonts.updateInner(flutter_cache.dart:141)[/-] [+]_CastError: Null check operator used on a null value at MaterialFonts.updateInner(flutter_cache.dart:141)[/+] on Sep 15, 2021

  3. jmagman commented on Sep 15, 2021

    @jmagman
    jmagman
    on Sep 15, 2021
    MemberAuthor

    A check for version existence was added after updateInner (too late) in #79864. I'm not sure why version is null at this point.

  4. TahaTesser
    added
    passed first triage
    on Oct 1, 2021
  5. christopherfujino
    added
    P2Important issues not at the top of the work list
    on Jan 27, 2022
  6. christopherfujino
    self-assigned this
    on Jan 27, 2022

  7. christopherfujino commented on Jan 27, 2022

    @christopherfujino
    christopherfujino
    on Jan 27, 2022
    Contributor

    it looks to me like this can only be null if the version file does not exist on disk: https://github.com/flutter/flutter/blob/master/packages/flutter_tools/lib/src/cache.dart#L609

        return versionFile.existsSync() ? versionFile.readAsStringSync().trim() : null;

    I'm not sure how that is possible though...

  8. christopherfujino commented on Jan 27, 2022

    @christopherfujino
    christopherfujino
    on Jan 27, 2022
    Contributor

    Ohh, actually, if I look at this: #91942

    The user does not have an engine version too, and are on Windows. I wonder if this is the unzipping error where not all files are present?

  9. christopherfujino
    removed their assignment
    on Jan 27, 2022
  10. flutter-triage-bot
    added
    team-toolOwned by Flutter Tool team
    triaged-toolTriaged by Flutter Tool team
    on Jul 8, 2023
  11. Hixie
    removed
    passed first triage
    on Jul 8, 2023

  12. christopherfujino commented on Jan 17, 2024

    @christopherfujino
    christopherfujino
    on Jan 17, 2024
    Contributor

    A newer stacktrace from #141450 at stable 3.13.1

    _TypeError: (#0 MaterialFonts.updateInner (package:flutter_tools/src/flutter_cache.dart:151:49))

#0      MaterialFonts.updateInner (package:flutter_tools/src/flutter_cache.dart:151:49)
#1      CachedArtifact.update (package:flutter_tools/src/cache.dart:812:11)
#2      Cache.updateAll (package:flutter_tools/src/cache.dart:679:24)
<asynchronous suspension>
#3      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:1566:7)
<asynchronous suspension>
#4      FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1297:27)
<asynchronous suspension>
#5      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#6      CommandRunner.runCommand (package:args/command_runner.dart:212:13)
<asynchronous suspension>
#7      FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:339:9)
<asynchronous suspension>
#8      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#9      FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:285:5)
<asynchronous suspension>
#10     run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:115:9)
<asynchronous suspension>
#11     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#12     main (package:flutter_tools/executable.dart:90:3)
<asynchronous suspension>
  13. tirth-patel-nc
    marked [tool_crash] _TypeError: (#0 MaterialFonts.updateInner (package:flutter_tools/src/flutter_cache.dart:152:49)) #170819 as a duplicate of this issue on Jun 18, 2025
  14. matanlurey
    added
    tool-still-validIssues that have been deemed still valid as part of the Flutter Tools issue cleanup initiative.
    on Jul 11, 2025
  15. tirth-patel-nc
    marked [tool_crash] _TypeError: (#0 MaterialFonts.updateInner (package:flutter_tools/src/flutter_cache.dart:152:49)) #175386 as a duplicate of this issue on Sep 16, 2025
  16. auto-submit
    closed this as completedin #191494on Aug 24, 2026
  17. pull
    added a commit that references this issue on Aug 24, 2026

    [flutter_tools] Handle null version gracefully in CachedArtifact and …

    0c0d059

  18. github-actions commented on Sep 7, 2026

    @github-actions
    github-actionsbot
    on Sep 7, 2026 – with GitHub Actions

    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 -v and a minimal reproduction of the issue.

  19. github-actions
    locked as resolved and limited conversation to collaborators on Sep 7, 2026
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    P2Important issues not at the top of the work listc: crashStack traces logged to the consoleteam-toolOwned by Flutter Tool teamtoolAffects the "flutter" command-line tool. See also t: labels.tool-still-validIssues that have been deemed still valid as part of the Flutter Tools issue cleanup initiative.triaged-toolTriaged by Flutter Tool team

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