PHP Fatal error: Uncaught Error: Call to undefined function mysql_real_escape_s

Please see fatal error in the latest version of premium plugin:

[18-Aug-2023 08:41:52 UTC] PHP Fatal error: Uncaught Error: Call to undefined function mysql_real_escape_string() in /wp-content/plugins/basepress-premium/includes/premium/class-basepress-adjacent-articles.php:113
Stack trace: 0 /wp-content/plugins/basepress-premium/public/public-functions.php(685): Basepress_Adjacent_Articles->get_adjacent_articles(true) 1 /wp-content/plugins/basepress-premium/themes/default/template-parts/adjacent-articles.php(10): basepress_prev_article() 2 /wp-content/plugins/basepress-premium/includes/class-basepress-utils.php(1487): require(‘/www/gfdlmain_2…’) 3 /wp-content/plugins/basepress-premium/public/public-functions.php(266): Basepress_Utils->get_template_part(‘adjacent-articl…’, ”) 4 /wp-content/plugins/basepress-premium/themes/default/two-columns-left.php(50): basepress_get_template_part(‘adjacent-articl…’) 5 /wp-includes/template-loader.php(106): include(‘/www/gfdlmain_2…’) 6 /wp-blog-header.php(19): require_once(‘/www/gfdlmain_2…’) 7 /index.php(17): require(‘/www/gfdlmain_2…’) 8 {main}

thrown in /wp-content/plugins/basepress-premium/includes/premium/class-basepress-adjacent-articles.php on line 113