dev-tool crashing with "path is undefined" (zen browser)

[nktnet1]

Which project does this relate to?

Router

Describe the bug

Tanstack router dev tool is crashing whenever I make a change to certain files with the error

path is not defined

and other errors unrelated to my applications:

Each child in a list should have a unique "key" prop.
Check the render method of `RouteComp`. See https://react.dev/link/warning-keys for more information.

Your Example Website or App

https://github.com/nktnet1/rt-stack

Steps to Reproduce the Bug or Issue

1. Set up the project

   pnpm dlx create-turbo@latest -m pnpm -e https://github.com/nktnet1/rt-stack example-project
   
   cd example-project
   pnpm install
   pnpm env:copy-example
   
   # Start a local postgres instance in the background (e.g. using docker)
   docker compose up db --detach
   
   # Push drizzle schema to your database
   pnpm db:push

2. Start the dev server and open http://localhost:8085/register in your browser

   pnpm dev
   

3. Register an account and go to the posts page. Create a new post.

4. Make any edits in ./apps/web/src/routes/_protected/posts/index.lazy.tsx and save the file.

5. Try hovering your mouse on the created post (or click on it). Observe the crash.

Expected behavior

Should not crash, similar to when there is no dev tools enabled in the video.

Screenshots or Videos

tanstack-router-dev-tools-crash.webm

Platform

Tested on:

• OS:
  • MacOS
  • Linux (Arch)
• Browser:
  • Zen Browser (firefox-based)
• Version

  '@tanstack/react-router': ^1.109.2
  '@tanstack/router-devtools': ^1.109.2
  

Additional context

This is a monorepo (turborepo) - unsure if relevant.
I wasn't able to reproduce it on a freshly created tanstack router project (not turborepo).

---

Update: can't reproduce on Firefox/Chrome either - potential issue with Zen Browser?