overleaf/overleaf · error

Split test '${splitTestName}' not found

Error message

Split test '${splitTestName}' not found

What it means

Precondition failure in the feature-flag migration script's main(): no document in the splittests Mongo collection matches the configured splitTestName, so the script cannot derive a version to convert into a feature flag. Check the script's splitTestName constant against the database.

Source

Thrown at services/web/scripts/insert_feature_flag_alpha_phase_0.mjs:69

      i--
      j--
    } else if (j > 0 && (i === 0 || dp[i][j - 1] >= dp[i - 1][j])) {
      result.unshift(`${GREEN}+ ${bLines[j - 1]}${RESET}`)
      j--
    } else {
      result.unshift(`${RED}- ${aLines[i - 1]}${RESET}`)
      i--
    }
  }

  return result.join('\n')
}

async function main() {
  const splitTest = await db.splittests.findOne({ name: splitTestName })

  if (!splitTest) {
    throw new Error(`Split test '${splitTestName}' not found`)
  }

  if (!splitTest.versions || splitTest.versions.length === 0) {
    throw new Error(`Split test '${splitTestName}' has no versions`)
  }

  const firstVersion = splitTest.versions[0]

  const newVersion = {
    ...firstVersion,
    versionNumber: 1,
    phase: 'alpha',
    active: true,
    variants: firstVersion.variants.map(v => ({
      ...v,
      rolloutPercent: 0,
      rolloutStripes: [],
    })),

View on GitHub (pinned to 28ad3b03b7)

Solutions

1. Verify the splitTestName constant matches an existing entry in the splittests collection
2. Run against the correct database/environment
3. Fix the name typo and re-run the script

When it happens

Trigger: Thrown at services/web/scripts/insert_feature_flag_alpha_phase_0.mjs:69 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of overleaf/overleaf@28ad3b03b7 (2026-09-03). Data as JSON: /api/errors/5fa7314a24de2444. Report an issue: GitHub.