diff --git a/comments.php b/comments.php
index e886a6e11..a71838713 100644
--- a/comments.php
+++ b/comments.php
@@ -86,6 +86,10 @@ if (isset($_GET['items_number']))
 {
   $page['items_number'] = $_GET['items_number'];
 }
+if ( !is_numeric($page['items_number']) and $page['items_number']!='all' ) 
+{
+  $page['items_number'] = 10;
+}
 
 $page['where_clauses'] = array();