### Describe the bug The application fail to generate a RSS feed on some podcasts, works on other podcasts ### Steps to reproduce 1. Click on RSS button ### Expected behavior A RSS feed to be generated ### Actual behavior A page printing: ``` Whoops! We seem to have hit a snag. Please try again later... ``` is shown and a CRITICAL error is thrown in logs ### Relevant logs and/or screenshots ``` CRITICAL - 2021-10-24 08:56:07 --> SimpleXMLElement::addAttribute(): Argument #2 ($value) must be of type string, null given #0 /castopod/app/Helpers/rss_helper.php(262): SimpleXMLElement->addAttribute('type', NULL) #1 /castopod/app/Controllers/FeedController.php(50): get_rss_feed(Object(App\Entities\Podcast), '') #2 /castopod/vendor/codeigniter4/codeigniter4/system/CodeIgniter.php(877): App\Controllers\FeedController->index('la_voix_est_lib...') #3 /castopod/vendor/codeigniter4/codeigniter4/system/CodeIgniter.php(416): CodeIgniter\CodeIgniter->runController(Object(App\Controllers\FeedController)) #4 /castopod/vendor/codeigniter4/codeigniter4/system/CodeIgniter.php(324): CodeIgniter\CodeIgniter->handleRequest(NULL, Object(Config\Cache), false) #5 /castopod/public/index.php(41): CodeIgniter\CodeIgniter->run() #6 {main} ``` ### Context - Castopod: 1.0.0-alpha.75 - OS: php8-alpine docker container (server), Manjaro (client) - Browser: Firefox - Web server: Nginx and PHP-FPM ### Possible fixes No idea but I can help you to investigate on this issue