---
title: "JavaScript errors we reproduced, and how to fix each one"
description: "Every JavaScript error here comes from a run in Chromium with the LogBrew browser SDK. Each guide gives the cause, the fix, and what LogBrew recorded."
canonical: "https://logbrew.co/en/errors"
last_updated: "2026-11-10"
---

# JavaScript errors we reproduced, and how to fix each one

Every JavaScript error here comes from a run in Chromium with the LogBrew browser SDK. Each guide gives the cause, the fix, and what LogBrew recorded.

By [Furkan Erday](https://github.com/furkanerday). Furkan Erday is the founder of LogBrew. He builds LogBrew with Claude Code and Codex every day.

Canonical: https://logbrew.co/en/errors

## JavaScript error fixes

Each error reproduced in a real browser with the LogBrew browser SDK, then fixed, with what LogBrew recorded from that run.

- [Fix the script error that hides its message, file, and line](https://logbrew.co/en/errors/script-error): `Script error.` with line 0 and no stack means the browser hid an error from a script on another origin. Add `crossorigin` and a CORS header to get the message back.
  Tested on November 10, 2026 with Chromium 152, @logbrew/browser 0.1.21, and @logbrew/sdk 0.1.44
- [Fix the Failed to fetch error and tell its 3 causes apart](https://logbrew.co/en/errors/failed-to-fetch): `TypeError: Failed to fetch` means the request got no HTTP response. A missing CORS header, a server that is down, and a host that does not exist all give this same message.
  Tested on November 10, 2026 with Chromium 152, @logbrew/browser 0.1.21, and @logbrew/sdk 0.1.44