PHP Error

Hi there,

on my site I’m receiving a random error (it only happens when I visit the site sometimes, other times it doesn’t display).

Warning: mb_strstr() [function.mb-strstr]: Empty haystack in /home//public_html/wp-includes/functions-formatting.php on line 45

I’ve cleared cache, tried from a few different computers, using different browsers, and like I said, the error only comes up randomly; sometimes it works fine, othertimes this error displays. And the other odd thing is that it only appears on the newest post, everything under that appears fine. The site is jimmyrichford.com if that helps. thanks.