error on new version 5.4.2

Just updated from 5.4.1

The update stopped revolution slider on homepage from working.

On my site I want the ajax popup login links to work on everypage, but for this to happen on non amember pages, I need to include the following files manually in the header.

if (!defined('ROOT_URL'))
{
// Enqueue the style
wp_enqueue_style('amember','/amember/application/default/views/public/css/amember.css',array(), null, 'all');
// Enqueue the scripts
wp_enqueue_script('amember1', '/amember/application/default/views/public/js/jquery/jquery.validate.js');
wp_enqueue_script('amember2', '/amember/application/default/views/public/js/jquery/jquery.ui.js');
wp_enqueue_script('amember3', '/amember/application/default/views/public/js/upload.js');
// wp_enqueue_script('amember4', '/amember/application/default/views/public/js/user.js');
}

But after the upgrade this was making revolution slider not work with the following error:-

Uncaught TypeError: jQuery(...).magicSelect is not a function
at initElements (user.js:442)
at HTMLDocument.<anonymous> (user.js:382)
at i (jquery.js:2)
at Object.fireWith [as resolveWith] (jquery.js:2)
at Function.ready (jquery.js:2)
at HTMLDocument.K (jquery.js:2)

When I remove the link to the following file the slider work ok, but the ajax popup login box no longer works

/amember/application/default/views/public/js/user.js

Is there a way to get the modal popup login box to work without it interferring with other things like revolution slider?

Thanks
Ben

Thanks, thats getting better.
Only console error now is:-

Code:

SCRIPT5009: 'am_i18n' is not defined

user.js (291,12)

Great thanks, its all working now, and rev slider is also working. Thanks for you help.

Questions:-
1. I added the var via functions.php using this code:-

Code:

// Add scripts to wp_head()
function child_theme_head_script() {
    if (!defined('ROOT_URL'))  {
?>
<script type="text/javascript">
    var am_i18n = {"toggle_password_visibility":"Toggle Password Visibility","password_strength":"Password Strength","upload_browse":"browse","upload_upload":"upload","upload_files":"Uploaded Files","upload_uploading":"Uploading...","ms_please_select":"-- Please Select --","ms_select_all":"Select All"};
    </script>
<?php } }
add_action( 'wp_head', 'child_theme_head_script' );

However is there a better way to add it maybe using "wp_localize_script" ?

2. I'm doing all this so that the popup modal login links work but is there a better way to achieve this, or is this approach the best way?

Many thanks
Ben