GoogleChrome/lighthouse · error · LighthouseError

TRACING_ALREADY_STARTED

TRACING_ALREADY_STARTED

Error message

An internal Chrome error occurred. Please restart Chrome and try re-running Lighthouse.

What it means

Error "An internal Chrome error occurred. Please restart Chrome and try re-running Lighthouse." thrown in GoogleChrome/lighthouse.

Source

Thrown at core/lib/lh-error.js:363

    message: UIStrings.pageLoadFailedInterstitial,
    lhrRuntimeError: true,
  },
  /* Used when the page stopped responding and did not finish loading. */
  PAGE_HUNG: {
    code: 'PAGE_HUNG',
    message: UIStrings.pageLoadFailedHung,
    lhrRuntimeError: true,
  },
  /* Used when the page is non-HTML. */
  NOT_HTML: {
    code: 'NOT_HTML',
    message: UIStrings.notHtml,
    lhrRuntimeError: true,
  },

  // Protocol internal failures
  TRACING_ALREADY_STARTED: {
    code: 'TRACING_ALREADY_STARTED',
    message: UIStrings.internalChromeError,
    pattern: /Tracing.*started/,
    lhrRuntimeError: true,
  },
  PARSING_PROBLEM: {
    code: 'PARSING_PROBLEM',
    message: UIStrings.internalChromeError,
    pattern: /Parsing problem/,
    lhrRuntimeError: true,
  },
  READ_FAILED: {
    code: 'READ_FAILED',
    message: UIStrings.internalChromeError,
    pattern: /Read failed/,
    lhrRuntimeError: true,
  },

  // URL parsing failures

View on GitHub (pinned to 9515cd4e58)

Solutions

1. Restart Chrome and re-run Lighthouse.
2. Update Chrome to the latest version.
3. Close other tabs and applications to free system resources.

When it happens

Trigger: Raised on an internal Chrome failure (e.g. target crashed or closed) during the run.

Common situations: See trigger scenarios.

AI-assisted analysis of GoogleChrome/lighthouse@9515cd4e58 (2026-08-13). Data as JSON: /api/errors/6f375061f474442b. Report an issue: GitHub.