core/lib/Drupal/Core/Entity/Entity.php |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/lib/Drupal/Core/Entity/Entity.php b/core/lib/Drupal/Core/Entity/Entity.php
index b7c23c4..6e4d504 100644
--- a/core/lib/Drupal/Core/Entity/Entity.php
+++ b/core/lib/Drupal/Core/Entity/Entity.php
@@ -326,6 +326,9 @@ public function postSave(EntityStorageControllerInterface $storage_controller, $
     // builder class, then invalidate the render cache of entities for which
     // this entity is a bundle.
     if ($update) {
+// Debug output to help determine the cause of the PHP fatal error at https://qa.drupal.org/pifr/test/737993
+var_dump($this->getEntityTypeId());
+var_dump($this->id());
       $bundle_of = $this->getEntityType()->getBundleOf();
       $entity_manager = \Drupal::entityManager();
       if ($bundle_of !== FALSE && $entity_manager->hasController($bundle_of, 'view_builder')) {