not compatible with PHP 8.0

This great plugin seems not to be compatible with PHP 8.0 (tested with 8.0.2). Is there a fix for this?

Error message when calling the settings-pgate of wordpress file monitor:

Fehler-Details
==============
Ein Fehler vom Typ E_ERROR wurde in der Zeile 583 der Datei /home/knowblog/public_html/wp-content/plugins/file-changes-monitor/classes/wpfmp.settings.class.php verursacht. Fehlermeldung: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in /home/knowblog/public_html/wp-content/plugins/file-changes-monitor/classes/wpfmp.settings.class.php:583
Stack trace:
#0 /home/knowblog/public_html/wp-content/plugins/file-changes-monitor/classes/wpfmp.settings.class.php(583): implode()
#1 /home/knowblog/public_html/wp-admin/includes/template.php(1737): sc_WordPressFileMonitorPlusSettings::sc_wpfmp_settings_main_field_file_extensions()
#2 /home/knowblog/public_html/wp-admin/includes/template.php(1695): do_settings_fields()
#3 /home/knowblog/public_html/wp-content/plugins/file-changes-monitor/classes/wpfmp.settings.class.php(282): do_settings_sections()
#4 /home/knowblog/public_html/wp-includes/class-wp-hook.php(287): sc_WordPressFileMonitorPlusSettings::settings_page()
#5 /home/knowblog/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters()
#6 /home/knowblog/public_html/wp-includes/plugin.php(484): WP_Hook->do_action()
#7 /home/knowblog/public_html/wp-admin/admin.php(259): do_action()
#8 /home/knowblog/public_html/wp-admin/options-general.php(10): require_once(‘…’)
#9 {main}
thrown