static public function getInstance(){
		if (!isset(self::$_instance)) {
			if (!sfConfig::get('app_amg_sentry_dsn')) {
				throw new Exception('Please configure amgSentryPlugin in your app.yml (use model in "amgSentryPlugin/config/app.yml")');
			}
			self::$_instance = new amgSentry(sfConfig::get('app_amg_sentry_dsn'), array('release' => sfConfig::get('app_amg_sentry_release')));
		}
		return self::$_instance;
	}