Title: ReferenceError: jQuery is not defined
Last modified: August 21, 2016

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# ReferenceError: jQuery is not defined

 *  [minutepapillon](https://wordpress.org/support/users/minutepapillon/)
 * (@minutepapillon)
 * [13 years, 1 month ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-1/)
 * Hi everyone,
    6 months ago, the Javascript of my admin pages stopped working.
   I don’t remember what I had changed on the site when it happened … `ReferenceError:
   jQuery is not defined` … is the error I got (Firebug.)
 * I found on a forum that it could be solved by changing this option (from true
   to false) in the wp-conif.php file :
    `define('CONCATENATE_SCRIPTS', false);`
 * It worked but slowed down my site a lot. I then thought it was not a big issue…
   but I changed my mind : it is !
    If I set the option back to true my site is 
   fast again but no more JS in the admin pages … Any idea to solve this problem?
   Thanks à lot. The problem is not theme dependent.

Viewing 1 replies (of 1 total)

 *  Thread Starter [minutepapillon](https://wordpress.org/support/users/minutepapillon/)
 * (@minutepapillon)
 * [13 years, 1 month ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-1/#post-3679808)
 * Well, I found the answer :
 * Bullet Proof Security plugin had to be updated, and the htaccess. of the wp-admin
   folder had to be updated.
    Note that updating the first does not update the second:
   You have to follow the usual procedure.
 * The former htaccess of the wp-admin folder was causing some sort of conflict 
   I guess.
 * Thanks to those who read this post …

Viewing 1 replies (of 1 total)

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## Tags

 * [jquery](https://wordpress.org/support/topic-tag/jquery/)
 * [ReferenceError](https://wordpress.org/support/topic-tag/referenceerror/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 1 reply
 * 1 participant
 * Last reply from: [minutepapillon](https://wordpress.org/support/users/minutepapillon/)
 * Last activity: [13 years, 1 month ago](https://wordpress.org/support/topic/referenceerror-jquery-is-not-defined-1/#post-3679808)
 * Status: not resolved

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