Uncaught ReferenceError: jQuery is not defined

Hi,

Upon upgrading to the latest WP, i think the plugin gives an error msg:
“(index):882 Uncaught ReferenceError: jQuery is not defined”

The specific line of code referred to is:
<!-- End Google Tag Manager (noscript) --><script>jQuery(document).ready(function(){var imgTitle;jQuery("img").hover(function(){imgTitle=jQuery(this).attr("title");jQuery(this).removeAttr("title")},function(){jQuery(this).attr("title",imgTitle)})})</script>

Any advice please? Thank you!