diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index a155778e83..2149e01487 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -524,7 +524,10 @@ function install_begin_request($class_loader, &$install_state) {
 
     // Do not install over a configured settings.php.
     if (Database::getConnectionInfo()) {
-      throw new AlreadyInstalledException($container->get('string_translation'));
+      // Commenting out this line to skip over
+      // an error when installing on Pantheon.
+      // @see https://github.com/stevector/drupal-9-project/issues/1
+      // throw new AlreadyInstalledException($container->get('string_translation'));
     }
   }