Fatal error: Uncaught TypeError: WP_Translation_Controller::set_locale(): Argument #1 ($locale) must be of type string, null given, called in /home/.sites/920/site6900013/web/wp-includes/l10n.php on line 804 and defined in /home/.sites/920/site6900013/web/wp-includes/l10n/class-wp-translation-controller.php:87
Stack trace:
#0 /home/.sites/920/site6900013/web/wp-includes/l10n.php(804): WP_Translation_Controller->set_locale(NULL)
#1 /home/.sites/920/site6900013/web/wp-includes/l10n.php(960): load_textdomain('default', '/home/.sites/92...', NULL)
#2 /home/.sites/920/site6900013/web/wp-content/plugins/polylang/src/olt-manager.php(75): load_default_textdomain(NULL)
#3 /home/.sites/920/site6900013/web/wp-includes/class-wp-hook.php(343): PLL_OLT_Manager->load_textdomains('en')
#4 /home/.sites/920/site6900013/web/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array)
#5 /home/.sites/920/site6900013/web/wp-includes/plugin.php(522): WP_Hook->do_action(Array)
#6 /home/.sites/920/site6900013/web/wp-content/plugins/polylang/src/frontend/choose-lang.php(128): do_action('pll_language_de...', 'en', Object(PLL_Language))
#7 /home/.sites/920/site6900013/web/wp-content/plugins/polylang/src/frontend/choose-lang-url.php(34): PLL_Choose_Lang->set_language()
#8 /home/.sites/920/site6900013/web/wp-content/plugins/polylang/src/frontend/frontend.php(134): PLL_Choose_Lang_Url->init()
#9 /home/.sites/920/site6900013/web/wp-content/plugins/polylang/src/class-polylang.php(280): PLL_Frontend->init()
#10 /home/.sites/920/site6900013/web/wp-content/plugins/polylang/src/class-polylang.php(224): Polylang->init_context('PLL_Frontend', Object(PLL_Model))
#11 /home/.sites/920/site6900013/web/wp-includes/class-wp-hook.php(341): Polylang->init('')
#12 /home/.sites/920/site6900013/web/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array)
#13 /home/.sites/920/site6900013/web/wp-includes/plugin.php(522): WP_Hook->do_action(Array)
#14 /home/.sites/920/site6900013/web/wp-settings.php(593): do_action('plugins_loaded')
#15 /home/.sites/920/site6900013/web/wp-config.php(132): require_once('/home/.sites/92...')
#16 /home/.sites/920/site6900013/web/wp-load.php(50): require_once('/home/.sites/92...')
#17 /home/.sites/920/site6900013/web/wp-blog-header.php(13): require_once('/home/.sites/92...')
#18 /home/.sites/920/site6900013/web/index.php(17): require('/home/.sites/92...')
#19 {main}
  thrown in /home/.sites/920/site6900013/web/wp-includes/l10n/class-wp-translation-controller.php on line 87

Fatal error: Uncaught TypeError: WP_Translation_Controller::set_locale(): Argument #1 ($locale) must be of type string, null given, called in /home/.sites/920/site6900013/web/wp-includes/l10n.php on line 804 and defined in /home/.sites/920/site6900013/web/wp-includes/l10n/class-wp-translation-controller.php:87
Stack trace:
#0 /home/.sites/920/site6900013/web/wp-includes/l10n.php(804): WP_Translation_Controller->set_locale(NULL)
#1 /home/.sites/920/site6900013/web/wp-includes/l10n.php(960): load_textdomain('default', '/home/.sites/92...', NULL)
#2 /home/.sites/920/site6900013/web/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#3 [internal function]: WP_Fatal_Error_Handler->handle()
#4 {main}
  thrown in /home/.sites/920/site6900013/web/wp-includes/l10n/class-wp-translation-controller.php on line 87