Catch the exception to avoid the immediate Fatal Error kill, but you still need to adjust to facebook data not being available. See http://www.php.net/catch
try {
// facebook code
} catch (Exception $e) {
// maybe something more graceful...
echo 'Caught exception: ', $e->getMessage(), "\n";
}
// regular execution continues.

If you are facebook developer, and are using the latest facebook php sdk, facebook.php grabbed from github.com, and are facing the problem similiar to as defined below:

PHP Fatal error: Uncaught CurlException: 6: name lookup timed out thrown in //facebook.php on line 592

This is probably the host is not given enough time to contact with facebook server. To solve this problem, open facebook.php with your editor, and go to line 89 to find the code below:

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public static $CURL_OPTS = array(
CURLOPT_CONNECTTIMEOUT => 10,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_TIMEOUT => 60,
CURLOPT_USERAGENT => 'facebook-php-2.0',
);
Modify CURLOPT_CONNECTION to increase its value to, 30 or higher.

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CURLOPT_CONNECTTIMEOUT => 30,
and test your facebook application again to see if it works.