---
title: Javascript-SDK - 4.2.1
slug: feature-experimentation/release-notes/javascript-sdk-4-2-1
docTags: 
createdAt: 2026-07-20T15:45:19.533Z
---

\## \[4.2.1] - August 10, 2020

\### Bug fixes
\- Remove incorrect warning about invalid variation ID when user not bucketed into experiment or feature rollout (\[#549]\([https://github.com/optimizely/javascript-sdk/pull/549](https://github.com/optimizely/javascript-sdk/pull/549)))

[https://github.com/optimizely/javascript-sdk/releases/tag/v4.2.1](https://github.com/optimizely/javascript-sdk/releases/tag/v4.2.1)