PHP Warning: preg_match() expects & PHP Warning: strip_tags()
<p>I got this error log, do you know what is this and how can i fix this?</p>

<pre><code>[31-Jan-2013 22:01:25 UTC] PHP Warning:  preg_match() expects parameter 2 to be string, array given in /home/xxx/public_html/wp-includes/formatting.php on line 608
[31-Jan-2013 22:01:25 UTC] PHP Warning:  strip_tags() expects parameter 1 to be string, array given in /home/xxx/public_html/wp-includes/formatting.php on line 968
</code></pre>
