Uncaught Error: Cannot use object of type WP_Error as array
in /var/www/vhosts/vyletnik.cz/httpdocs/www/wp-content/themes/vyletnik/app/helpers.php on line 831

Call stack:

1. App\get_post_list()
   wp-content/themes/vyletnik/app/View/Composers/Archive.php:134
2. App\V\C\Archive::getPosts()
   wp-content/themes/vyletnik/app/View/Composers/Archive.php:46
3. App\V\C\Archive::with()
   wp-content/themes/vyletnik/vendor/roots/acorn/src/Roots/Acorn/View/Composer.php:70
4. Roots\A\V\Composer::merge()
   wp-content/themes/vyletnik/vendor/roots/acorn/src/Roots/Acorn/View/Composer.php:59
5. Roots\A\V\Composer::compose()
   wp-content/themes/vyletnik/vendor/illuminate/view/Concerns/ManagesEvents.php:124
6. Illuminate\V\Factory::Illuminate\V\C\{closure}()
   wp-content/themes/vyletnik/vendor/illuminate/events/Dispatcher.php:421
7. Illuminate\E\Dispatcher::Illuminate\E\{closure}()
   wp-content/themes/vyletnik/vendor/illuminate/events/Dispatcher.php:249
8. Illuminate\Events\Dispatcher::dispatch()
   wp-content/themes/vyletnik/vendor/illuminate/view/Concerns/ManagesEvents.php:177
9. Illuminate\View\Factory::callComposer()
   wp-content/themes/vyletnik/vendor/illuminate/view/View.php:176
10. Illuminate\View\View::renderContents()
    wp-content/themes/vyletnik/vendor/illuminate/view/View.php:147
11. Illuminate\View\View::render()
    wp-content/themes/vyletnik/index.php:1
12. include('/var/www/vhosts/vyle...s/vyletnik/index.php')
    wp-includes/template-loader.php:132
13. require_once('/var/www/vhosts/vyle.../template-loader.php')
    wp-blog-header.php:19
14. require('/var/www/vhosts/vyle...w/wp-blog-header.php')
    index.php:17