Invitation links fail in Chrome with browser policies

Last updated: March 6, 2026

Summary

Issue: Experiments or invitation links fail to load in certain browsers (typically Chrome), showing WebAssembly is not defined errors or blank pages, while the same links work in other browsers like Safari. Cause: Corporate browser security policies block WebAssembly components required by Braintrust. 

Resolution: Use an alternative browser without the same security restrictions.

Applicable To

Plans: Free, Pro, Enterprise

Deployments: Braintrust Hosted

Use case: Accessing experiments or invitation links with corporate-managed browsers

Resolution Steps

If experiments fail to load in your primary browser

Step 1: Test in an alternative browser

Open the same experiment or invitation link in Safari, Firefox, or Edge to verify the issue is browser-specific.

Step 2: Switch to the working browser

Use the alternative browser for accessing Braintrust experiments and invitation links.

If you need to use your primary browser

Step 1: Contact your admin

Request that WebAssembly be enabled for braintrust.dev in your browser security policy.

Step 2: Verify browser console errors

Open Developer Tools (F12), check the Console tab for WebAssembly-related errors to confirm the root cause with your admin.

Additional Information

Common error indicators

  • ReferenceError: WebAssembly is not defined in browser console

  • [BTQL-WASM] Initialization failed: ReferenceError: WebAssembly is not defined

  • Blank pages when loading experiments

  • Invitation links that timeout or fail to authenticate

Example console error

646a5b81339cf33a.js:2 Uncaught (in promise) ReferenceError: WebAssembly is not defined
    at H (646a5b81339cf33a.js:2:16859)
    at er (646a5b81339cf33a.js:2:17574)
    ...
36aa4112263b63f2.js:17 [BTQL-WASM] Initialization failed: ReferenceError: WebAssembly is not defined

Browsers commonly affected

  • Chrome with corporate security policies

  • Edge with managed browser settings