Title: Uncaught ReferenceError: YoastSEO is not defined at HTMLDocument. Last modified: January 14, 2019 --- # Uncaught ReferenceError: YoastSEO is not defined at HTMLDocument. * Resolved [sunnyiett](https://wordpress.org/support/users/sunnyiett/) * (@sunnyiett) * [7 years, 4 months ago](https://wordpress.org/support/topic/uncaught-referenceerror-yoastseo-is-not-defined-at-htmldocument/) * Hello hope u can help. * when i update yoast i´ll geht these error. When plugins disabled i have no error. The following plugin causes this error: * 3D FlipBook – Light Edition * [https://wordpress.org/plugins/interactive-3d-flipbook-powered-physics-engine/](https://wordpress.org/plugins/interactive-3d-flipbook-powered-physics-engine/) * following Concole errors i get: * Uncaught TypeError: (0 , c.createContext) is not a function at Object.599 (wp- element-940.min.js:1) at r (wp-element-940.min.js:1) at Object.596 (wp-element- 940.min.js:1) at r (wp-element-940.min.js:1) at wp.element.124 (wp-element-940. min.js:1) at wp-element-940.min.js:1 wp-data-940.min.js:1 Uncaught TypeError: Cannot read property ‘createContext’ of undefined at Object.123 (wp-data-940. min.js:1) at r (wp-data-940.min.js:1) at Object.565 (wp-data-940.min.js:1) at r (wp-data-940.min.js:1) at Object.564 (wp-data-940.min.js:1) at r (wp-data-940. min.js:1) at wp.data.1 (wp-data-940.min.js:1) at wp-data-940.min.js:1 wp-components- 940.min.js:12 Uncaught TypeError: Cannot read property ‘forwardRef’ of undefined at Object. (wp-components-940.min.js:12) at n (wp-components-940.min. js:1) at Object. (wp-components-940.min.js:12) at n (wp-components- 940.min.js:1) at Object. (wp-components-940.min.js:12) at n (wp-components- 940.min.js:1) at wp-components-940.min.js:1 at wp-components-940.min.js:1 wp- seo-help-center-940.min.js:1 Uncaught TypeError: Cannot read property ‘createElement’ of undefined at Object.894 (wp-seo-help-center-940.min.js:1) at f (commons-940. min.js:1) at t (commons-940.min.js:1) at Array.r [as push] (commons-940.min.js: 1) at wp-seo-help-center-940.min.js:1 wp-seo-post-scraper-940.min.js:1 Uncaught TypeError: Cannot read property ‘createContext’ of undefined at Object. (wp-seo-post-scraper-940.min.js:1) at f (commons-940.min.js:1) at Object. (wp-seo-post-scraper-940.min.js:1) at f (commons-940.min.js:1) at Object. (wp-seo-post-scraper-940.min.js:1) at f (commons-940.min.js:1) at Object. (wp-seo-post-scraper-940.min.js:1) at f (commons-940.min.js:1) at Object. (wp-seo-post-scraper-940.min.js:1) at f (commons-940.min.js:1) yoast-compat. min.js:1 Uncaught ReferenceError: YoastSEO is not defined at HTMLDocument. (yoast-compat.min.js:1) at i (load-scripts.php:2) at Object.fireWith [as resolveWith]( load-scripts.php:2) at Function.ready (load-scripts.php:2) at HTMLDocument.K ( load-scripts.php:2) load-scripts.php:9 JQMIGRATE: Migrate is installed, version 1.4.1 hauptheader_standorte.jpg:1 Failed to load resource: the server responded with a status of 404 () * hope u can help * greetz sunnyiett Viewing 5 replies - 1 through 5 (of 5 total) * [Pcosta88](https://wordpress.org/support/users/pcosta88/) * (@pcosta88) * [7 years, 4 months ago](https://wordpress.org/support/topic/uncaught-referenceerror-yoastseo-is-not-defined-at-htmldocument/#post-11091501) * Hi * We would like some more information. * A. Are all your non-Yoast plugins and themes also updated? * B. Can you confirm you are using the most recent Yoast SEO, v9.4.1? If you update, does the issue resolve? This guide explains more about how to update: [https://kb.yoast.com/kb/how-can-i-update-my-free-plugin/](https://kb.yoast.com/kb/how-can-i-update-my-free-plugin/) * C. When you deactivated plugins did you also switch themes? If not, can you please confirm the issue still happens when Yoast and 3D Flipbook are both active and your theme is 2019? * Thread Starter [sunnyiett](https://wordpress.org/support/users/sunnyiett/) * (@sunnyiett) * [7 years, 4 months ago](https://wordpress.org/support/topic/uncaught-referenceerror-yoastseo-is-not-defined-at-htmldocument/#post-11103215) * Good Moorning, sry i was ill last days. * A) yes theme and all non yoast plugins * B) now i have deactivated the troobleshooting plugin ad use the new version of yoastuntil i´ve a solution * C) Yes it still happens when i ´ve Yoast and 3D Flipbook are both active and my theme is 2019. * Plugin Support [amboutwe](https://wordpress.org/support/users/amboutwe/) * (@amboutwe) * [7 years, 4 months ago](https://wordpress.org/support/topic/uncaught-referenceerror-yoastseo-is-not-defined-at-htmldocument/#post-11108792) * Based on the information you provided, we expect this to be a bug. We’re actively using the bug tracking on our GitHub repository so your best next step would be to create a new issue for our developers [here](https://github.com/Yoast/wordpress-seo/issues). You will need an account to create a new issue. Don’t forget to include the URL to this conversation in your bug report. * As the issue is a conflict with another plugin, we highly recommend reporting the issue to the development or support team for 3D Flipbook. Having both teams work on the issue is a benefit to you. * If you have not submitted an issue previously, this [guide](https://kb.yoast.com/kb/how-to-write-a-good-bug-report/#utm_source=support&utm_medium=forum&utm_campaign=support-link) will help you submit a complete report which may result in a faster resolution. * Thread Starter [sunnyiett](https://wordpress.org/support/users/sunnyiett/) * (@sunnyiett) * [7 years, 4 months ago](https://wordpress.org/support/topic/uncaught-referenceerror-yoastseo-is-not-defined-at-htmldocument/#post-11111645) * ok thank you very much. * [devnihil](https://wordpress.org/support/users/devnihil/) * (@devnihil) * [7 years, 4 months ago](https://wordpress.org/support/topic/uncaught-referenceerror-yoastseo-is-not-defined-at-htmldocument/#post-11122373) * You’re welcome. We are going ahead and marking this issue as resolved due to inactivity. If you require any further assistance please create a new issue. Viewing 5 replies - 1 through 5 (of 5 total) The topic ‘Uncaught ReferenceError: YoastSEO is not defined at HTMLDocument.’ is closed to new replies. * ![](https://ps.w.org/wordpress-seo/assets/icon-256x256.gif?rev=3419908) * [Yoast SEO - Advanced SEO with real-time guidance and built-in AI](https://wordpress.org/plugins/wordpress-seo/) * [Frequently Asked Questions](https://wordpress.org/plugins/wordpress-seo/#faq) * [Support Threads](https://wordpress.org/support/plugin/wordpress-seo/) * [Active Topics](https://wordpress.org/support/plugin/wordpress-seo/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wordpress-seo/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wordpress-seo/reviews/) ## Tags * [3d flipbook](https://wordpress.org/support/topic-tag/3d-flipbook/) * [error plugins](https://wordpress.org/support/topic-tag/error-plugins/) * [javascript](https://wordpress.org/support/topic-tag/javascript/) * [js](https://wordpress.org/support/topic-tag/js/) * 5 replies * 4 participants * Last reply from: [devnihil](https://wordpress.org/support/users/devnihil/) * Last activity: [7 years, 4 months ago](https://wordpress.org/support/topic/uncaught-referenceerror-yoastseo-is-not-defined-at-htmldocument/#post-11122373) * Status: resolved