Error message when posting a message that has a link to a image with eval in the file name.

When posting a message with a img tag to an image that is hosted offsite and that image has eval in the file name, this error is displayed:
[phpBB Debug] PHP Warning: in file /includes/message_parser.php on line 71: Please contact support about failure
Fatal error: preg_replace() [<a href='function.preg-replace'>function.preg-replace</a>]: Failed evaluating code: $this->bbcode_img('linktoimage') in /path/to/forum/includes/message_parser.php on line 71