“technical difficulties” Mail with custom Login-URL

Hello,
I have changed the login URL in WP Cerber. Every time someone connects to *my-domain*/wp-login.php, I get an email that my website has “technical difficulties”.
Is this intentional or is it possible to turn it off?

WordPress-Version 5.7.2
Aktuelles Theme: Kadence Child (Version 1.0.1)
Aktuelles Plugin:  (Version )
PHP-Version 7.4.19

Fehler-Details
==============
Ein Fehler vom Typ E_ERROR wurde in der Zeile 741 der Datei *my-domain*/wp-content/themes/kadence/inc/template-functions/header-functions.php verursacht. Fehlermeldung: Uncaught Error: Call to a member function get_cart_contents_count() on null in *my-domain*/wp-content/themes/kadence/inc/template-functions/header-functions.php:741
Stack trace:
#0 *my-domain*/wp-includes/class-wp-hook.php(292): Kadence\header_cart('')
#1 *my-domain*/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters('', Array)
#2 *my-domain*/wp-includes/plugin.php(484): WP_Hook->do_action(Array)
#3 *my-domain*/wp-content/themes/kadence/template-parts/header/cart.php(18): do_action('kadence_header_...')
#4  *my-domain*/wp-includes/template.php(732): require('/www/htdocs/w01...')
#5 *my-domain*/wp-includes/template.php(676): load_template('/www/htdocs/w01...', false, Array)
#6  *my-domain*/wp-includes/general-template.php(204): locate_template(Array, true, false, Array)
#7  *my-domain*/wp-cont