PHP Fatal error – php 8.0

error:

`[04-Oct-2022 07:34:21 UTC] PHP Fatal error: Uncaught TypeError: round(): Argument #1 ($num) must be of type int|float, string given in /srv/htdocs/wp-content/plugins/yet-another-related-posts-plugin/includes/template_builtin.php:33
Stack trace:
#0 /srv/htdocs/wp-content/plugins/yet-another-related-posts-plugin/includes/template_builtin.php(33): round(”, 1)
#1 /srv/htdocs/wp-content/plugins/yet-another-related-posts-plugin/classes/YARPP_Core.php(1655): include(‘/srv/htdocs/wp-…’)
#2 /srv/htdocs/wp-content/plugins/yet-another-related-posts-plugin/classes/YARPP_Core.php(1527): YARPP->get_template_content(95, Array)
#3 /srv/htdocs/wp-content/plugins/yet-another-related-posts-plugin/classes/YARPP_Core.php(1384): YARPP->display_related(95, Array, false)
#4 /srv/htdocs/wp-content/plugins/yet-another-related-posts-plugin/classes/YARPP_Core.php(2020): YARPP->display_basic()
#5 /wordpress/core/6.0.2/wp-includes/class-wp-hook.php(307): YARPP->the_content(‘\n<p>We’ve…’)
#6 /wordpress/core/6.0.2/wp-includes/plugin.php(191): WP_Hook->apply_filters(‘\n<p>We’ve…’, Array)
#7 /wordpress/core/6.0.2/wp-includes/post-template.php(253): apply_filters(‘the_content’, ‘<!– wp:paragra…’)
#8 /srv/htdocs/wp-content/themes/astra/template-parts/single/single-layout.php(43): the_content()
#9 /wordpress/core/6.0.2/wp-includes/template.php(772): require(‘/srv/htdocs/wp-…’)
#10 /wordpress/core/6.0.2/wp-includes/template.php(716): load_template(‘/srv/htdocs/wp-…’, false, Array)
#11 /wordpress/core/6.0.2/wp-includes/general-template.php(204): locate_template(Array, true, false, Array)
#12 /srv/htdocs/wp-content/themes/astra/inc/template-parts.php(264): get_template_part(‘template-parts/…’)
#13 /wordpress/core/6.0.2/wp-includes/class-wp-hook.php(307): astra_entry_content_single_template(”)
#14 /wordpress/core/6.0.2/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(”, Array)
#15 /wordpress/core/6.0.2/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#16 /srv/htdocs/wp-content/themes/astra/inc/core/theme-hooks.php(443): do_action(‘astra_entry_con…’)
#17 /srv/htdocs/wp-content/themes/astra/template-parts/content-single.php(29): astra_entry_content_single()
#18 /wordpress/core/6.0.2/wp-includes/template.php(772): require(‘/srv/htdocs/wp-…’)
#19 /wordpress/core/6.0.2/wp-includes/template.php(716): load_template(‘/srv/htdocs/wp-…’, false, Array)
#20 /wordpress/core/6.0.2/wp-includes/general-template.php(204): locate_template(Array, true, false, Array)
#21 /srv/htdocs/wp-content/themes/astra/inc/class-astra-loop.php(120): get_template_part(‘template-parts/…’, ‘single’)
#22 /wordpress/core/6.0.2/wp-includes/class-wp-hook.php(307): Astra_Loop->template_parts_post(”)
#23 /wordpress/core/6.0.2/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(”, Array)
#24 /wordpress/core/6.0.2/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#25 /srv/htdocs/wp-content/themes/astra/inc/class-astra-loop.php(199): do_action(‘astra_template_…’)
#26 /wordpress/core/6.0.2/wp-includes/class-wp-hook.php(307): Astra_Loop->loop_markup(”)
#27 /wordpress/core/6.0.2/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(”, Array)
#28 /wordpress/core/6.0.2/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#29 /srv/htdocs/wp-content/themes/astra/inc/core/theme-hooks.php(258): do_action(‘astra_content_l…’)
#30 /srv/htdocs/wp-content/themes/astra/single.php(27): astra_content_loop()
#31 /wordpress/core/6.0.2/wp-includes/template-loader.php(106): include(‘/srv/htdocs/wp-…’)
#32 /wordpress/core/6.0.2/wp-blog-header.php(19): require_once(‘/wordpress/core…’)
#33 /wordpress/core/6.0.2/index.php(17): require(‘/wordpress/core…’)
#34 {main}
thrown in /srv/htdocs/wp-content/plugins/yet-another-related-posts-plugin/includes/template_builtin.php on line 33`

I have this error when use PHP 8.0, but if I downgrade to PHP 7.4, it fixed
I deactive all plugin , but still have this error with PHP 8.0