artisan command catch PHP Fatal error

I am using phpseclib and if there is no connection to the server a "user_error" is thrown.

The code to simulate the problem in a Artisan Command - just use an nonexistig IP and you can simulate the problem:

public function fire()
{	
	try {
		$sshCon=SSH::into('myServer')->getGateway()->getConnection();
	} catch(RuntimeException $e) {
		$this->error($e->getMessage());
		Log::error($e);
	}
}

The Error Msg:

Cannot connect to XXX.XXX.XX.XX:22. Error 51. Network is unreachable
PHP Fatal error:  Uncaught exception 'ErrorException' with message 'Connection closed prematurely' in /SVN-Checkouts/project/vendor/phpseclib/phpseclib/phpseclib/Net/SSH2.php:3126

How can I catch this error?

I have tired to add this to /app/start/artisan.php:

App::error(function(ErrorException $exception) {
    Log::error($exception);
});

App::fatal(function($exception)
{
    Log::error($exception);
});

When I debug the app - the user_error is converted into an ErrorException which is thrown by the app but non of my custom error Handler gets called.

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