diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index a16e845..02e9e79 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -2222,6 +2222,9 @@ function install_config_import_batch() {
   // Match up the site uuids, the install_base_system install task will have
   // installed the system module and created a new UUID.
   $system_site = $sync->read('system.site');
+  if (empty($system_site['uuid'])) {
+    throw new InstallerException(t('Unable to find the Site UUID from config sync.'));
+  }
   \Drupal::configFactory()->getEditable('system.site')->set('uuid', $system_site['uuid'])->save();
 
   // Create the storage comparer and the config importer.