Title: JS Error / Warning
Last modified: June 4, 2026

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# JS Error / Warning

 *  [KreativeLabs](https://wordpress.org/support/users/kreativelabs/)
 * (@kreativelabs)
 * [4 days, 21 hours ago](https://wordpress.org/support/topic/js-error-warning/)
 * I just noticed that there is a console error on every page, related to Easy Optimizer.
 * `[Error] Unhandled Promise Rejection: Error: Speculation Rules not supported,
   fell back to prefetch.
   (unknown function) (easyoptlink.js:312:99)
 * related code:
 * `if ((bothMode || prerenderMode) && prerendered.size < limit) {
   prerender(hrefFn?
   hrefFn(anchor) : anchor.href, options.eagerness).catch(function (err) { if (options.
   onError) options.onError(err); else throw err; });return;}
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fjs-error-warning%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Contributor [Uzair](https://wordpress.org/support/users/uzairwp/)
 * (@uzairwp)
 * [3 days, 12 hours ago](https://wordpress.org/support/topic/js-error-warning/#post-18929924)
 * Thanks for reporting this. It’s a false-positive warning and does not affect 
   functionality. We’ve already fixed it in the latest version, so please update
   and let us know if you still notice any issues.

Viewing 1 replies (of 1 total)

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to reply to this topic.

 * ![](https://ps.w.org/easy-optimizer/assets/icon-256x256.gif?rev=3545305)
 * [Easy Optimizer – Speed, Cache, Unused CSS, Delay JS, Lazy Load, LCP & Core Web Vitals](https://wordpress.org/plugins/easy-optimizer/)
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## Tags

 * [cache plugin](https://wordpress.org/support/topic-tag/cache-plugin/)

 * 1 reply
 * 2 participants
 * Last reply from: [Uzair](https://wordpress.org/support/users/uzairwp/)
 * Last activity: [3 days, 12 hours ago](https://wordpress.org/support/topic/js-error-warning/#post-18929924)
 * Status: not resolved