In requesting a preview of a file uploaded through the front end of the site I got this error

Warning: array_push(): First argument should be an array in /home/jensclas/public_html/class/module.textsanitizer.php on line 113


what does it mean and how do I fix it?

The photo was 'successfuly' recieved with same warning as in previous post and then don't show at all

Thanks