Fatal errors in PHP 8.1

Hello, I am testing the update of our server to PHP 8 and the plugin breaks.

[03-Jan-2023 11:17:57 UTC] PHP Warning:  foreach() argument must be of type array|object, string given in /var/www/<virtualhost>/www/wp-content/plugins/advanced-notifications/includes/an-functions.php on line 96
[03-Jan-2023 11:17:57 UTC] PHP Fatal error:  Uncaught TypeError: Unsupported operand types: array + string in /var/www/<virtualhost>/www/wp-content/plugins/advanced-notifications/includes/an-functions.php:104
Stack trace:
#0 /var/www/<virtualhost>/www/wp-content/plugins/advanced-notifications/includes/an-functions.php(113): AdvancedNotificationsFunctions->register_notifications()
#1 /var/www/<virtualhost>/www/wp-content/plugins/advanced-notifications/includes/an-functions.php(124): AdvancedNotificationsFunctions->notifications_list()
#2 /var/www/<virtualhost>/www/wp-content/plugins/advanced-notifications/includes/an-functions.php(144): AdvancedNotificationsFunctions->active_notifications_list()
#3 /var/www/<virtualhost>/www/wp-content/plugins/advanced-notifications/includes/an-functions.php(50): AdvancedNotificationsFunctions->get_page_notifications()
#4 /var/www/<virtualhost>/www/wp-includes/class-wp-hook.php(308): AdvancedNotificationsFunctions->add_enqueue()
#5 /var/www/<virtualhost>/www/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#6 /var/www/<virtualhost>/www/wp-includes/plugin.php(517): WP_Hook->do_action()
#7 /var/www/<virtualhost>/www/wp-includes/script-loader.php(2180): do_action()
#8 /var/www/<virtualhost>/www/wp-includes/class-wp-hook.php(308): wp_enqueue_scripts()
#9 /var/www/<virtualhost>/www/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#10 /var/www/<virtualhost>/www/wp-includes/plugin.php(517): WP_Hook->do_action()
#11 /var/www/<virtualhost>/www/wp-includes/general-template.php(3043): do_action()
#12 /var/www/<virtualhost>/www/wp-content/themes/jupiter-child/header.php(4): wp_head()
#13 /var/www/<virtualhost>/www/wp-includes/template.php(783): require_once('...')
#14 /var/www/<virtualhost>/www/wp-includes/template.php(718): load_template()
#15 /var/www/<virtualhost>/www/wp-includes/general-template.php(48): locate_template()
#16 /var/www/<virtualhost>/www/wp-content/themes/jupiter/page.php(8): get_header()
#17 /var/www/<virtualhost>/www/wp-includes/template-loader.php(106): include('...')
#18 /var/www/<virtualhost>/www/wp-blog-header.php(19): require_once('...')
#19 /var/www/<virtualhost>/www/index.php(17): require('...')
#20 {main}
  thrown in /var/www/<virtualhost>/www/wp-content/plugins/advanced-notifications/includes/an-functions.php on line 104

Since PHP 7.4 is EOL, do you mind to fix this bug ?

Thanks