Fatal error: Uncaught TypeError: Argument 1 passed to WP_Translation_Controller::set_locale() must be of the type string, null given, called in /web/htdocs6/dotranscz/home/www/wp-includes/l10n.php on line 804 and defined in /web/htdocs6/dotranscz/home/www/wp-includes/l10n/class-wp-translation-controller.php:87 Stack trace: #0 /web/htdocs6/dotranscz/home/www/wp-includes/l10n.php(804): WP_Translation_Controller->set_locale(NULL) #1 /web/htdocs6/dotranscz/home/www/wp-content/plugins/polylang/include/olt-manager.php(106): load_textdomain('rank-math', '/web/htdocs6/do...') #2 /web/htdocs6/dotranscz/home/www/wp-includes/class-wp-hook.php(343): PLL_OLT_Manager->load_textdomains('de') #3 /web/htdocs6/dotranscz/home/www/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) #4 /web/htdocs6/dotranscz/home/www/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #5 /web/htdocs6/dotranscz/home/www/wp-content/plugins/polylang/frontend/choose-lang.php(112): do_action('pll_language_de...', 'de', Object(PLL_Language)) in /web/htdocs6/dotranscz/home/www/wp-includes/l10n/class-wp-translation-controller.php on line 87

Fatal error: Uncaught TypeError: Argument 1 passed to WP_Translation_Controller::set_locale() must be of the type string, null given, called in /web/htdocs6/dotranscz/home/www/wp-includes/l10n.php on line 804 and defined in /web/htdocs6/dotranscz/home/www/wp-includes/l10n/class-wp-translation-controller.php:87 Stack trace: #0 /web/htdocs6/dotranscz/home/www/wp-includes/l10n.php(804): WP_Translation_Controller->set_locale(NULL) #1 /web/htdocs6/dotranscz/home/www/wp-includes/l10n.php(960): load_textdomain('default', '/web/htdocs6/do...', NULL) #2 /web/htdocs6/dotranscz/home/www/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain() #3 [internal function]: WP_Fatal_Error_Handler->handle() #4 {main} thrown in /web/htdocs6/dotranscz/home/www/wp-includes/l10n/class-wp-translation-controller.php on line 87