--- ./src/Controller/FieldablePathController.php	2017-05-18 11:51:40.000000000 +0200
+++ ./src/Controller/FieldablePathController.php	2017-05-18 11:59:01.000000000 +0200
@@ -43,7 +43,7 @@
       ->load($params[$entity_type]);
 
     // Make sure the current entity exists and contains path field.
-    if (empty($entity) || !$entity->hasField('path')) {
+    if (empty($entity) || !(method_exists($entity, 'hasField') && $entity->hasField('path'))) {
       return;
     }