diff --git a/core/lib/Drupal/Core/Entity/EntityTypeMalformedException.php b/core/lib/Drupal/Core/Entity/EntityTypeMalformedException.php
new file mode 100644
index 0000000..ab14448
--- /dev/null
+++ b/core/lib/Drupal/Core/Entity/EntityTypeMalformedException.php
@@ -0,0 +1,13 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Entity\EntityMalformedException.
+ */
+
+namespace Drupal\Core\Entity;
+
+/**
+ * Defines an exception thrown when a malformed entity is passed.
+ */
+class EntityMalformedException extends \Exception { }