PHP 8.0 error log page

This plugin is very useful for my clients. Thanks a lot for that. The Email Log page is giving a technical issue when PHP 8.0 is used.

ERROR:
An error of type E_ERROR was caused in line 63 of the file ../public_html/wp-content/plugins/post-smtp/Postman/PostmanLogFields.php. Error message: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in ../public_html/wp-content/plugins/post-smtp/Postman/PostmanLogFields.php:63

Stack trace:
#0 ../public_html/wp-content/plugins/post-smtp/Postman/PostmanLogFields.php(63): implode()
#1 ../public_html/wp-content/plugins/post-smtp/Postman/PostmanLogFields.php(39): PostmanLogFields->maybe_json()
#2 ../public_html/wp-content/plugins/post-smtp/Postman/Postman-Email-Log/PostmanEmailLogView.php(371): PostmanLogFields->get()
#3 ../public_html/wp-content/plugins/post-smtp/Postman/Postman-Email-Log/PostmanEmailLogController.php(412): PostmanEmailLogView->prepare_items()
#4 ../public_html/wp-includes/class-wp-hook.php(303): PostmanEmailLogController->postman_render_email_page()
#5 ../public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters()
#6 ../public_html/wp-includes/plugin.php(470): WP_Hook->do_action()
#7 ../public_html/wp-admin/admin.php(259): do_action()
#8 {main}
thrown`

Thanks in advance.