Undefined array key “deactivate”, php fatal error

Dear Support,
We got fatal error.
Details:
WordPress: 6.1
PHP version: 8.1

Error:
Got error ‘PHP message: PHP Warning: Undefined array key “deactivate” in …./frontend/wp-content/plugins/nelio-ab-testing/admin/pages/class-nelio-ab-testing-plugin-list-page.php on line 60’, referer …./wp-admin/plugins.php

1. wp-content/plugins/nelio-ab-testing/admin/pages/class-nelio-ab-testing-plugin-list-page.php:60
2. Nelio_AB_Testing_Plugin_List_Page->customize_plugin_actions()
   wp-includes/class-wp-hook.php:310
3. apply_filters('plugin_action_links_nelio-ab-testing/nelio-ab-testing.php')
   wp-admin/includes/class-wp-plugins-list-table.php:974
4. WP_Plugins_List_Table->single_row()
   wp-admin/includes/class-wp-plugins-list-table.php:695
5. WP_Plugins_List_Table->display_rows()
   wp-admin/includes/class-wp-list-table.php:1444
6. WP_List_Table->display_rows_or_placeholder()
   wp-admin/includes/class-wp-list-table.php:1371
7. WP_List_Table->display()
   wp-admin/plugins.php:773

Could you please check and fix it.

Thanks in advance !