diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index c8dac96f11e..074f626f299 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -1144,14 +1144,14 @@ function top_htmlhead($head, $title='', $disablejs=0, $disablehead=0, $arrayofjs
         {
             // JQuery. Must be before other includes
             print '<!-- Includes JS for JQuery -->'."\n";
-            if (defined('JS_JQUERY')) print '<script type="text/javascript" src="'.JS_JQUERY.'jquery.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";
+            if (defined('JS_JQUERY') && constant('JS_JQUERY')) print '<script type="text/javascript" src="'.JS_JQUERY.'jquery.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";
             else print '<script type="text/javascript" src="'.DOL_URL_ROOT.'/includes/jquery/js/jquery.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";
             if (! empty($conf->global->MAIN_FEATURES_LEVEL))
             {
-                if (defined('JS_JQUERY_MIGRATE')) print '<script type="text/javascript" src="'.JS_JQUERY_MIGRATE.'jquery-migrate.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";
+                if (defined('JS_JQUERY_MIGRATE') && constant('JS_JQUERY_MIGRATE')) print '<script type="text/javascript" src="'.JS_JQUERY_MIGRATE.'jquery-migrate.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";
                 else print '<script type="text/javascript" src="'.DOL_URL_ROOT.'/includes/jquery/js/jquery-migrate.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";
             }
-            if (defined('JS_JQUERY_UI')) print '<script type="text/javascript" src="'.JS_JQUERY_UI.'jquery-ui.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";
+            if (defined('JS_JQUERY_UI') && constant('JS_JQUERY_UI')) print '<script type="text/javascript" src="'.JS_JQUERY_UI.'jquery-ui.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";
             else print '<script type="text/javascript" src="'.DOL_URL_ROOT.'/includes/jquery/js/jquery-ui.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";
             if (! defined('DISABLE_JQUERY_TABLEDND')) print '<script type="text/javascript" src="'.DOL_URL_ROOT.'/includes/jquery/plugins/tablednd/jquery.tablednd.0.6.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";
             if (! defined('DISABLE_JQUERY_TIPTIP')) print '<script type="text/javascript" src="'.DOL_URL_ROOT.'/includes/jquery/plugins/tiptip/jquery.tipTip.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";