As [mysql_real_escape_string()][1] was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0, you can try [esc_sql()][2] to work for later WP/PHP versions.

Replace mysql_real_escape_string() with esc_sql() at line 111 & 118 in your admin-interface.php file.

Hope this should work well for you! [1]: http://php.net/manual/en/function.mysql-real-escape-string.php [2]: https://codex.wordpress.org/Function_Reference/esc_sql

As mysql_real_escape_string() was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0, you can try esc_sql() to work for later WP/PHP versions.

Replace mysql_real_escape_string() with esc_sql() at line 111 & 118 in your admin-interface.php file.

Hope this should work well for you!