Title: ReferenceError: jQuery is not defined at Last modified: January 11, 2020 --- # ReferenceError: jQuery is not defined at * [djavin](https://wordpress.org/support/users/djavin/) * (@djavin) * [6 years, 5 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/) * Hi, I have installed this plugin and the Chrome console errors is now not using the unsafe old jquery version, but I do get this error: * ReferenceError: jQuery is not defined at [https://mysite](https://mysite) * Is there a solution for this? * Thanks 🙂 Vincent Viewing 12 replies - 1 through 12 (of 12 total) * Plugin Author [Ramoonus](https://wordpress.org/support/users/ramoonus/) * (@ramoonus) * [6 years, 4 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-12390635) * which file is the source of this error? * [kaiuwe](https://wordpress.org/support/users/kaiuwe/) * (@kaiuwe) * [5 years, 11 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13111249) * Same issue here. * (index):2 Uncaught ReferenceError: jQuery is not defined at (index):2 (index): 36 Uncaught ReferenceError: jQuery is not defined at (index):36 * ReferenceError: jQuery is not defined at [https://ais-advanced.de/:2:21785](https://ais-advanced.de/:2:21785) ReferenceError: jQuery is not defined at [https://ais-advanced.de/:36:10861](https://ais-advanced.de/:36:10861) * Hope there is any solution. * Thanks in advance * Plugin Author [Ramoonus](https://wordpress.org/support/users/ramoonus/) * (@ramoonus) * [5 years, 11 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13111296) * hello kaiuwe could you give me more details? * [kaiuwe](https://wordpress.org/support/users/kaiuwe/) * (@kaiuwe) * [5 years, 11 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13116053) * What details you want? We must switch of the plugin because fixed Header and Header menue was not working after activation. If you like we can activate again for your check. * [kaiuwe](https://wordpress.org/support/users/kaiuwe/) * (@kaiuwe) * [5 years, 10 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13126911) * No support here? * Plugin Author [Ramoonus](https://wordpress.org/support/users/ramoonus/) * (@ramoonus) * [5 years, 10 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13127018) * yes I am here you are using a CDN. could you verify jQuery is correctly loaded from the server? * [kaiuwe](https://wordpress.org/support/users/kaiuwe/) * (@kaiuwe) * [5 years, 10 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13128260) * I check it with and without KeyCDN and bypass Cloudflare. Still same issue. * [kaiuwe](https://wordpress.org/support/users/kaiuwe/) * (@kaiuwe) * [5 years, 10 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13130460) * We activated your plugin again and will leave it like this for some hours now. You can check it on the page. You will see the errors i mentioned above already( ReferenceError: jQuery is not defined). The fixed header is not fixed anymore and on mobile the burger-menu is not working. * Plugin Author [Ramoonus](https://wordpress.org/support/users/ramoonus/) * (@ramoonus) * [5 years, 10 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13130505) * i`ve checked, you can disable now if you need to * the jQuery files are loaded and it`s not a CDN problem the order of which files are loades is also okay except the files are defered loading. i presume this is a setting in the caching plugin. could you try to disable that setting? * [kaiuwe](https://wordpress.org/support/users/kaiuwe/) * (@kaiuwe) * [5 years, 10 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13130667) * We disabled JavaScript deferred setting in WP-Rocket. Seems to be working now. Maybe you can crosscheck it. * [kaiuwe](https://wordpress.org/support/users/kaiuwe/) * (@kaiuwe) * [5 years, 10 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13130750) * However, we highly appreciate your support, thank you! Without you we would have never fixed this issue. * Plugin Author [Ramoonus](https://wordpress.org/support/users/ramoonus/) * (@ramoonus) * [5 years, 10 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13130934) * console doesn`t give any warnings only a positive message JQMIGRATE: Migrate is installed, version 3.3.0 * scripts are indeed loading properly now Viewing 12 replies - 1 through 12 (of 12 total) The topic ‘ReferenceError: jQuery is not defined at’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/jquery-updater.svg) * [jQuery Updater](https://wordpress.org/plugins/jquery-updater/) * [Frequently Asked Questions](https://wordpress.org/plugins/jquery-updater/#faq) * [Support Threads](https://wordpress.org/support/plugin/jquery-updater/) * [Active Topics](https://wordpress.org/support/plugin/jquery-updater/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/jquery-updater/unresolved/) * [Reviews](https://wordpress.org/support/plugin/jquery-updater/reviews/) * 12 replies * 3 participants * Last reply from: [Ramoonus](https://wordpress.org/support/users/ramoonus/) * Last activity: [5 years, 10 months ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-at/#post-13130934) * Status: not resolved