## TL;DR

When I upgraded resend from version 6.4.2 to the latest 6.9.1, I received an error during deployment and preview using wrangler. [gabrielmfern (maintainer)]: Seems like this was fixed in v6.9.2 through #820; the reproduction no longer breaks in it too.

```text
, I received an error during deployment and preview using
```

## Steps

1. [gabrielmfern (maintainer)]: Seems like this was fixed in v6.9.2 through #820; the reproduction no longer breaks in it too. Going to close; if anyone still experiences this, let me know and I'll reopen.

## When to use

You are seeing this: Issue resend/resend-node#826 (closed, 7 comments): ### Describe the Bug I was upgrading my project deps and found deploy issue on cloudflare workers caused of one of deps. Use this skill when you run into "v6.9.0+ broken build on cloudflare workers with nuxt/nitro. Uncaught TypeError: Zv.hasOwnProperty is not a function".

## When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

## Versions

Versions mentioned in the source: 6.4.2, 6.9.1, v6.9.2. If you are on something much newer or older, the details may have shifted.

## Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.