diff --git a/core/modules/config/lib/Drupal/config/Form/ConfigSingleImportForm.php b/core/modules/config/lib/Drupal/config/Form/ConfigSingleImportForm.php
index 24913c7..645c27e 100644
--- a/core/modules/config/lib/Drupal/config/Form/ConfigSingleImportForm.php
+++ b/core/modules/config/lib/Drupal/config/Form/ConfigSingleImportForm.php
@@ -205,8 +205,8 @@ public function validateForm(array &$form, array &$form_state) {
       }
     }
     else {
-      $config = $this->config($form_state['values']['config_name']);
-      $this->configExists = $config->isNew() ? $config : FALSE;
+      $config = $this->configStorage->read($form_state['values']['config_name']);
+      $this->configExists = !empty($config) ? TRUE : FALSE;
     }
 
     // Store the decoded version of the submitted import.