Error in php log

Hello,

I’m getting this notice in php log:

Notice: Undefined index: aj_theme_exclusions in /var/www/html/wp-content/plugins/async-javascript/asyncjsAllAjax.php on line 393
Stack trace
1. {main}() /var/www/html/wp-admin/admin-ajax.php:0
2. do_action() /var/www/html/wp-admin/admin-ajax.php:187
3. WP_Hook->do_action() /var/www/html/wp-includes/plugin.php:484
4. WP_Hook->apply_filters() /var/www/html/wp-includes/class-wp-hook.php:316
5. AsyncJavaScriptBackend->aj_steps() /var/www/html/wp-includes/class-wp-hook.php:292
6. require_once() /var/www/html/wp-content/plugins/async-javascript/asyncjsBackendClass.php:349

Regards!