there isn't any error when I use this code the website just freezes and wont load and have to recover?.

Code:
<div class="widget">
    <h2>Newest Users</h2>
    <div class="inner">
	
	<?php
	$query = mysql_query("SELECT `username` FROM `users` WHERE `active` = 1 ORDER BY `id` DESC LIMIT 0, 10");
		echo "<ul>\n";
		while (($row = mysql_fetch_assoc($query)) !== false) {
		echo "<li>" . $row['username'] . "</li>\n";
		}
		echo "</ul>\n";
	?>
	
    </div>
</div>