No comments are loaded — with PHP notice and warning

Hi there!

I have just installed the plugin. And no comments are loaded on a test page with 1 comment (though I have the correct number of comments indicated).

I got the following notices/warnings:
[14-Oct-2021 14:29:14 UTC] PHP Notice: Undefined index: comment in …/wp-content/themes/hueman/comments.php on line 10
[14-Oct-2021 14:29:14 UTC] PHP Warning: count(): Parameter must be an array or an object that implements Countable in …/wp-content/themes/hueman/comments.php on line 10
[14-Oct-2021 14:29:14 UTC] PHP Notice: Undefined index: pings in …/wp-content/themes/hueman/comments.php on line 11
[14-Oct-2021 14:29:14 UTC] PHP Warning: count(): Parameter must be an array or an object that implements Countable in …/wp-content/themes/hueman/comments.php on line 11

I got Hueman theme for WP. The latest WP. PHP 7.4.23 (same was with 7.2.31).

What shoud I do to fix it?

Thank you!