Error – Warning: array_map

Hello! Your plugin is great, and I was able to implement easily, when I create a page, if I have a Feslider already defined, I publish the page and everything is ok. Now the problem, if I create a page: without a slider; with or without a featured image, when I publish that page I get this warning. Warning: array_map(): Argument #2 should be an array in /wp-content/plugins/feslider/feslider.php on line 92 Warning: array_map(): Argument #2 should be an array in /wp-content/plugins/feslider/feslider.php on line 93 Warning: array_map(): Argument #2 should be an array in /wp-content/plugins/feslider/feslider.php on line 94 Warning: array_map(): Argument #2 should be an array in /wp-content/plugins/feslider/feslider.php on line 92 Warning: array_map(): Argument #2 should be an array in /wp-content/plugins/feslider/feslider.php on line 93 Warning: array_map(): Argument #2 should be an array in /wp-content/plugins/feslider/feslider.php on line 94 Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/feslider/feslider.php:92) in /wp-admin/post.php on line 197 Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/feslider/feslider.php:92) in /wp-includes/pluggable.php on line 1210 How can I solve this? Cheers!