PHP errors

I’m seeing lots of these errors in my error logs:

2020/04/02 13:46:07 [error] 31380#31380: *68262 FastCGI sent in stderr: "
PHP message: PHP Warning:  array_map(): Expected parameter 2 to be an array, null given in /home/example.com/public_html/wp-content/plugins/ba-plus-before-after-image-slider-free/admin.php on line 124
PHP message: PHP Warning:  Invalid argument supplied for foreach() in /home/example.com/public_html/wp-content/plugins/ba-plus-before-after-image-slider-free/admin.php on line 125
PHP message: PHP Warning:  array_map(): Expected parameter 2 to be an array, null given in /home/example.com/public_html/wp-content/plugins/ba-plus-before-after-image-slider-free/admin.php on line 124
PHP message: PHP Warning:  Invalid argument supplied for foreach() in /home/example.com/public_html/wp-content/plugins/ba-plus-before-after-image-slider-free/admin.php on line 125" while reading response header from upstream, client: xx.xx.xx.xx, server: example.com, request: "POST /wp-admin/post.php HTTP/2.0", upstream: "fastcgi://unix:/var/opt/remi/php74/run/php-fpm/www.sock:", host: "www.example.com", referrer: "https://www.example.com/wp-admin/post.php?post=59661&action=edit"

WordPress 5.3.2 with version 1.0.1 of the BA Plus plug-in.