Can happen when a non admin logged in user is on the site and nothing that requires jQuery is part of the page so your theme decides not to load it. If your custom code, e.g. some javascript on a page, needs it then you can use this to cause it to always be loaded
Add this code to your theme functions.php
//********** ENSURE jQuery IS ALWAYS LOADED ON ALL PAGES **********
//(we use in our custom code)
wp_enqueue_script( 'jquery' );Feel free to comment if you can add help to t
USEFUL?
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