# Bug: "Disallowed operation called within global scope" error in v2.0.41

[melihakyol06]

Bug: "Disallowed operation called within global scope" error in v2.0.41

Description

After upgrading from @rivetkit/cloudflare-workers@2.0.33 to @rivetkit/cloudflare-workers@2.0.41, the dev server fails to start with the error:

Uncaught Error: Disallowed operation called within global scope. Asynchronous I/O (ex: fetch() or connect()), setting a timeout, and generating random values are not allowed within global scope. To fix this error, perform this operation within a handler. https://developers.cloudflare.com/workersruntime-apis/handlers/

Environment

• @rivetkit/cloudflare-workers: 2.0.41 (broken), 2.0.33 (works)
• rivetkit: 2.0.41
• wrangler: 4.60.0
• Platform: Cloudflare Workers

Steps to Reproduce

1. Create a Cloudflare Workers project with RivetKit
2. Use @rivetkit/cloudflare-workers@2.0.41
3. Run dev server
4. Error occurs immediately

Workaround

Downgrade to version 2.0.33.

[linear]

RVT-5342

[NathanFlurry]

will look in to this, i think i know what' sup. do you have a call to createClient anywhere in your backend code?

[melihakyol06]

No, we don't have any createClient calls in our backend code. The client is only created on the frontend (with "import { createRivetKit } from '@rivetkit/react'"). Our backend just exports the actors and handles the Hono server setup.