Warning messages on PHP 8.0.19

After I updated PHP from 7.4 to 8.0，this plugin shown the following warning messages as the following.

Warning: Undefined array key “sow-carousel-default” in /var/www/xxxx/htdocs/wp-content/plugins/image-sizes/views/settings/disable-sizes.php on line 87

Warning: Trying to access array offset on value of type null in /var/www/xxxx/htdocs/wp-content/plugins/image-sizes/views/settings/disable-sizes.php on line 88

Warning: Trying to access array offset on value of type null in /var/www/xxxx/htdocs/wp-content/plugins/image-sizes/views/settings/disable-sizes.php on line 92

Warning: Trying to access array offset on value of type null in /var/www/xxxx/htdocs/wp-content/plugins/image-sizes/views/settings/disable-sizes.php on line 93

PHP 7.4 lifecycle almost ends, if you could resolve this issue, it is great for all users.