Additional uncaught exception thrown while handling exception.

Original

TypeError: Drupal\Core\Extension\ThemeHandler::addTheme(): Argument #1 ($theme) must be of type Drupal\Core\Extension\Extension, null given, called in /var/www/html/core/includes/theme.maintenance.inc on line 70 in Drupal\Core\Extension\ThemeHandler->addTheme() (line 82 of /var/www/html/core/lib/Drupal/Core/Extension/ThemeHandler.php).

Drupal\Core\Extension\ThemeHandler->addTheme(NULL) (Line: 70)
_drupal_maintenance_theme() (Line: 316)
drupal_maintenance_theme() (Line: 514)
install_begin_request(Object, Array) (Line: 116)
install_drupal(Object) (Line: 48)

Additional

TypeError: Drupal\Core\Extension\ThemeHandler::addTheme(): Argument #1 ($theme) must be of type Drupal\Core\Extension\Extension, null given, called in /var/www/html/core/includes/theme.maintenance.inc on line 70 in Drupal\Core\Extension\ThemeHandler->addTheme() (line 82 of /var/www/html/core/lib/Drupal/Core/Extension/ThemeHandler.php).

Drupal\Core\Extension\ThemeHandler->addTheme(NULL) (Line: 70)
_drupal_maintenance_theme() (Line: 316)
drupal_maintenance_theme() (Line: 1023)
install_display_output(Array, Array) (Line: 271)
_drupal_log_error(Array, 1) (Line: 176)
_drupal_exception_handler(Object)