Error
The website encountered an unexpected error. Try again later.TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in array_keys() (line 70 of core/lib/Drupal/Core/Extension/ThemeHandler.php).
array_keys() (Line: 70) Drupal\Core\Extension\ThemeHandler->listInfo() (Line: 61) _drupal_maintenance_theme() (Line: 324) drupal_maintenance_theme() (Line: 519) install_begin_request() (Line: 118) install_drupal() (Line: 53)