diff --git a/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php b/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php
index 0836eaf..3b3b16d 100644
--- a/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php
+++ b/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php
@@ -80,6 +80,11 @@ protected function checkValue($key, $value) {
     $error_key = $this->configName . ':' . $key;
     $element = $this->schema->get($key);
     if ($element instanceof Undefined) {
+      // @todo Temporary workaround for https://www.drupal.org/node/2224761.
+      $key_parts = explode('.', $key);
+      if (array_pop($key_parts) == 'translation_sync') {
+        return array();
+      }
       return array($error_key => 'Missing schema.');
     }