private function reachUpFirstNestedLevel(array $event)
    {
        $repackEvent = [];
        foreach ($event as $key => $value) {
            if (is_array($value)) {
                foreach ($value as $nestedKey => $nestedValue) {
                    $repackEvent["$key.$nestedKey"] = $nestedValue;
                }
            } else if (!is_array($value)) {
                $repackEvent[$key] = $value;
            }
        }
        return $repackEvent;
    }