Title: form-render.min.js throws error
Last modified: November 30, 2018

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# form-render.min.js throws error

 *  Resolved [soulwasted](https://wordpress.org/support/users/soulwasted/)
 * (@soulwasted)
 * [7 years, 5 months ago](https://wordpress.org/support/topic/form-render-min-js-throws-error/)
 * Hi,
 * I’ve updated some plugins.
    Now I got this error in console when editing ERF 
   form in admin…
 *     ```
       form-render.min.js?ver=4.9.8:6 Uncaught Error: only one instance of babel-polyfill is allowed
           at Object.<anonymous> (form-render.min.js?ver=4.9.8:6)
           at Object.<anonymous> (form-render.min.js?ver=4.9.8:6)
           at e (form-render.min.js?ver=4.9.8:6)
           at Object.<anonymous> (form-render.min.js?ver=4.9.8:6)
           at e (form-render.min.js?ver=4.9.8:6)
           at form-render.min.js?ver=4.9.8:6
           at form-render.min.js?ver=4.9.8:6
       ```
   
 * Maybe it’s problem of another plugin. But I run into this here.
 * Thanks for investigation.
 * pepę

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Thread Starter [soulwasted](https://wordpress.org/support/users/soulwasted/)
 * (@soulwasted)
 * [7 years, 5 months ago](https://wordpress.org/support/topic/form-render-min-js-throws-error/#post-10934304)
 * From my “investigation” which plugins use “babel-polyfill” on my web.
    — easy-
   registration-forms — sitepress-multilingual-cms — wordpress-seo
 * Maybe you are “handling” Yoast SEO (wordpress-seo) but WPML (sitepress-multilingual-
   cms) still breaks it.
    Don’t know… Just thinking aloud.
 *  Thread Starter [soulwasted](https://wordpress.org/support/users/soulwasted/)
 * (@soulwasted)
 * [7 years, 5 months ago](https://wordpress.org/support/topic/form-render-min-js-throws-error/#post-10934348)
 * Ok… I’ve added
    `wp_deregister_script('wp-polyfill');` To your “build.php” as
   temporary solution. And your forms work now.
 * It’s dirty but maybe it will give you some clue 😉
    -  This reply was modified 7 years, 5 months ago by [soulwasted](https://wordpress.org/support/users/soulwasted/).
 *  Plugin Author [easyregistrationforms](https://wordpress.org/support/users/easyregistrationforms/)
 * (@easyregistrationforms)
 * [7 years, 5 months ago](https://wordpress.org/support/topic/form-render-min-js-throws-error/#post-10946391)
 * Hello,
 * It seems one of your new plugin is loading another instance of babel-pollyfill
   library. As of now this library is not shipped with WordPress hence plugin vendors
   uses their own library.
 * It appears some other plugin is loading different version of the library on our
   page. We would suggest you to deactivate the plugins one by one to identify the
   culprit.
 * As this issues appears only on form builder page, as a temporary resolution you
   can disable the other plugin while editing form. Soon WordPress will be adding
   this library then this conflict will be resolved.
 *  Thread Starter [soulwasted](https://wordpress.org/support/users/soulwasted/)
 * (@soulwasted)
 * [7 years, 5 months ago](https://wordpress.org/support/topic/form-render-min-js-throws-error/#post-10947921)
 * Hi,
 * it’s Yoast SEO as I didn’t mention above but found it.
    Path: `wp-content/plugins/
   wordpress-seo/admin/class-admin-asset-manager.php`
 * Code:
 *     ```
       // IE11 needs wp-polyfill to be registered before react.
       if ( $script && ! in_array( 'wp-polyfill', $script->deps, true ) ) {
       	$script->deps[] = 'wp-polyfill';
       }
       ```
   
 * And some more in the same file…
 * So I’ve added
    `wp_deregister_script('wp-polyfill');` To your “build.php” as 
   temporary solution.
 * pepę

Viewing 4 replies - 1 through 4 (of 4 total)

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 * 4 replies
 * 2 participants
 * Last reply from: [soulwasted](https://wordpress.org/support/users/soulwasted/)
 * Last activity: [7 years, 5 months ago](https://wordpress.org/support/topic/form-render-min-js-throws-error/#post-10947921)
 * Status: resolved