Fatal error on update / login

After the update to the current version 1.5.0 of the plugin the following error occured:

Fehler-Details
==============
Ein Fehler vom Typ E_ERROR wurde in der Zeile 168 der Datei /.../wp-content/plugins/protect-login/includes/multisite-functions.php verursacht. Fehlermeldung: Uncaught TypeError: protect_login_lockout_on_multisite(): Argument #1 ($address) must be of type string, array given, called in /.../wp-content/plugins/protect-login/includes/api.php on line 123 and defined in /.../wp-content/plugins/protect-login/includes/multisite-functions.php:168
Stack trace:
#0 /.../wp-content/plugins/protect-login/includes/api.php(123): protect_login_lockout_on_multisite()
#1 /.../wp-content/plugins/protect-login/modules/LimitLoginAttempts/Controllers/class-optionspage.php(32): protect_login_sync_lists_from_remote_api()
#2 /.../wp-content/plugins/protect-login/protect-login.php(53): ProtectLogin\Modules\LimitLoginAttempts\Controllers\OptionsPage->__construct()
#3 /.../wp-includes/class-wp-hook.php(341): {closure:/.../wp-content/plugins/protect-login/protect-login.php:52}()
#4 /.../wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()
#5 /.../wp-includes/plugin.php(522): WP_Hook->do_action()
#6 /.../wp-admin/includes/menu.php(168): do_action()
#7 /.../wp-admin/menu.php(441): require_once('/usr/www/users/...')
#8 /.../wp-admin/admin.php(163): require('/usr/www/users/...')
#9 /.../wp-admin/update-core.php(10): require_once('/usr/www/users/...')
#10 {main}
  thrown

It will then no longer be possible to log in to WordPress

[30-Jun-2026 06:50:21 UTC] PHP Fatal error:  Uncaught TypeError: protect_login_lockout_on_multisite(): Argument #1 ($address) must be of type string, array given, called in /.../wp-content/plugins/protect-login_3/includes/api.php on line 123 and defined in /.../wp-content/plugins/protect-login_3/includes/multisite-functions.php:168
Stack trace:
#0 /.../wp-content/plugins/protect-login_3/includes/api.php(123): protect_login_lockout_on_multisite()
#1 /.../wp-content/plugins/protect-login_3/modules/LimitLoginAttempts/Controllers/class-loginhandler.php(393): protect_>
#2 /.../wp-content/plugins/protect-login_3/modules/LimitLoginAttempts/Controllers/class-loginhandler.php(143): ProtectL>
#3 /.../wp-includes/class-wp-hook.php(341): ProtectLogin\Modules\LimitLoginAttempts\Controllers\LoginHandler->protect_l>
#4 /.../wp-includes/plugin.php(205): WP_Hook->apply_filters()
#5 /.../wp-includes/pluggable.php(706): apply_filters()
#6 /.../wp-includes/user.php(109): wp_authenticate()
#7 /.../wp-login.php(1322): wp_signon()
#8 {main}

Unfortunately, the only thing that helps at the moment is to deactivate the plugin

Thank you in advance for your time and help
Markus