diff --git a/core/lib/Drupal/Core/TypedData/Validation/ClassMetadata.php b/core/lib/Drupal/Core/TypedData/Validation/ClassMetadata.php
index 47a3c93..5bf4b2e 100755
--- a/core/lib/Drupal/Core/TypedData/Validation/ClassMetadata.php
+++ b/core/lib/Drupal/Core/TypedData/Validation/ClassMetadata.php
@@ -79,7 +79,7 @@ public function getConstrainedProperties() {
       return array_keys($this->typedData->getProperties());
     }
     else {
-      throw new \LogicException("There are no known properties.");
+      return array();
     }
   }