Bug: Uncaught Error: Commit tree already contains fiber "725". This is a bug in React DevTools.

[Innei]

React version:

react: 19.2.3
react devtools 7.0.1

Steps To Reproduce

1. Load this data profiling-data.27-01-2026.22-07-13.json
2. press 100 in nav

Link to code example:

The current behavior

The error was thrown at updateTree (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:699600)
    at getCommitTree (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:698832)
    at $e.getCommitTree (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:703384)
    at CommitFlamegraphAutoSizer (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:1005870)
    at renderWithHooks (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:66940)
    at updateFunctionComponent (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:97513)
    at beginWork (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:111594)
    at performUnitOfWork (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:184246)
    at workLoopSync (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:184102)
    at renderRootSync (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:183886)

The error occurred at CommitFlamegraphAutoSizer (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:1005671)
    at div (<anonymous>)
    at div (<anonymous>)
    at div (<anonymous>)
    at SettingsModalContextController (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:879909)
    at chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:1144384
    at ao (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:898411)
    at div (<anonymous>)
    at div (<anonymous>)
    at ThemeProvider (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:901116)
    at chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:901313
    at div (<anonymous>)
    at div (<anonymous>)
    at div (<anonymous>)
    at ThemeProvider (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:901116)
    at SuspenseTreeContextController (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:1147064)
    at InspectedElementContextController (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:915935)
    at TimelineContextController (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:994422)
    at ProfilerContextController (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:986233)
    at TreeContextController (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:786019)
    at SettingsContextController (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:815755)
    at ModalDialogContextController (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:972480)
    at DevTools_DevTools (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:1:1175879)

The expected behavior

No throw

[hoxyq]

Hey, thanks for reporting the issue, this is a known problem.

I might have a fix for it in #35718, but I don't know if this will work for your exact case. Will you be able to download the experimental build of the extension from CI and check if it works? The file name is react-devtools-chrome-extension

CI run - https://github.com/facebook/react/actions/runs/21786075080?pr=35718

[KebapBoy]

Hey, I got the same error while trying to profile my application and selecting specific render cycles/commits in the Profiler tab.

With the new version from the CI pipeline I don't get this error anymore. But when I load the profiling data from @Innei I can still reproduce it with a slightly different error message:

Details

Uncaught Error: Could not clone the node: commit tree does not contain fiber "731". This is a bug in React DevTools.

The error was thrown at getClonedNode (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:709866)
    at updateTree (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:711621)
    at getCommitTree (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:709341)
    at qe.getCommitTree (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:714128)
    at CommitFlamegraphAutoSizer (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:1023692)
    at renderWithHooks (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:68210)
    at updateFunctionComponent (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:96714)
    at beginWork (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:111553)
    at performUnitOfWork (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:186148)
    at workLoopSync (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:186004)

The error occurred at CommitFlamegraphAutoSizer (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:1023493)
    at div (<anonymous>)
    at div (<anonymous>)
    at div (<anonymous>)
    at SettingsModalContextController (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:893883)
    at chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:1161789
    at so (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:913324)
    at div (<anonymous>)
    at div (<anonymous>)
    at ThemeProvider (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:916029)
    at chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:916226
    at div (<anonymous>)
    at div (<anonymous>)
    at div (<anonymous>)
    at ThemeProvider (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:916029)
    at SuspenseTreeContextController (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:1165239)
    at InspectedElementContextController (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:930848)
    at TimelineContextController (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:1012244)
    at ProfilerContextController (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:1002196)
    at TreeContextController (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:798853)
    at SettingsContextController (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:829147)
    at ModalDialogContextController (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:987572)
    at DevTools_DevTools (chrome-extension://mkmknpldcmefmkppnplkaimbcppcfcka/build/main.js:1:1200045)