diff --git a/MY_Upload.php b/MY_Upload.php
index 0d36b10..6bc3a3e 100644
--- a/MY_Upload.php
+++ b/MY_Upload.php
@@ -9,7 +9,7 @@ class MY_Upload extends CI_Upload {
 	public function do_multi_upload( $field = 'userfile', $return_info = TRUE, $filenames = NULL ){
 
 		// Is $_FILES[$field] set? If not, no reason to continue.
-		if ( ! isset($_FILES[$field]))
+		if ( empty($_FILES[$field]) )
 		{
 			
 			$this->set_error('upload_no_file_selected');
@@ -160,7 +160,7 @@ public function do_multi_upload( $field = 'userfile', $return_info = TRUE, $file
 				}
 	
 				// Sanitize the file name for security
-				$this->file_name = $this->clean_file_name($this->file_name);
+				$this->file_name = $this->_CI->security->sanitize_filename($this->file_name);
 		
 				// Truncate the file name if it's too long
 				if ($this->max_filename > 0)