PHP Notice: Undefined index: title

Just letting you know that when the Widgets admin page is loaded, your plugin dumps many undefined index errors.

Undefined index for all fields: title, taxonomy, orderby, ascdsc, exclude, expandoptions, childof

PHP 7.4.2
WordPress 5.5.1
List Custom Taxonomy Widget 4.1

[13-Sep-2020 23:38:22 UTC] PHP Notice:  Undefined index: title in /wp-content/plugins/list-custom-taxonomy-widget/list-custom-taxonomy-widget.php on line 217
[13-Sep-2020 23:38:22 UTC] PHP Stack trace:
[13-Sep-2020 23:38:22 UTC] PHP   1. {main}() /wp-admin/widgets.php:0
[13-Sep-2020 23:38:22 UTC] PHP   2. wp_list_widgets() /wp-admin/widgets.php:448
[13-Sep-2020 23:38:22 UTC] PHP   3. wp_widget_control() /wp-admin/includes/widgets.php:60
[13-Sep-2020 23:38:22 UTC] PHP   4. lc_taxonomy->form_callback() /wp-admin/includes/widgets.php:274
[13-Sep-2020 23:38:22 UTC] PHP   5. lc_taxonomy->form() /wp-includes/class-wp-widget.php:519

Hopefully you can find some time to update this plugin.