Epoch Comments CLI error on line 504

When running an unrelated WP-CLI command, I got this error:

Warning: Trying to access array offset on null in /srv/htdocs/wp-content/plugins/rating-system/comments.php on line 504

To avoid it, I changed line 504 from this:

$epoch_var = $epoch['options']['theme'];

to this:

$epoch_var = (is_array($epoch) && isset($epoch['options']['theme'])) ? $epoch['options']['theme'] : '';