Resolve #3347502 "Access to an undefined property"

Closes #3347502

core/lib/Drupal/Core/Entity/EntityBase.php

@@ -417,7 +417,7 @@ public function preSave(EntityStorageInterface $storage) {
     if ($this->getEntityType()->getBundleOf()) {
       // Throw an exception if the bundle ID is longer than 32 characters.
       if (mb_strlen($this->id()) > EntityTypeInterface::BUNDLE_MAX_LENGTH) {
-        throw new ConfigEntityIdLengthException("Attempt to create a bundle with an ID longer than " . EntityTypeInterface::BUNDLE_MAX_LENGTH . " characters: $this->id().");
+        throw new ConfigEntityIdLengthException("Attempt to create a bundle with an ID longer than " . EntityTypeInterface::BUNDLE_MAX_LENGTH . " characters: " . $this->id() . ".");
       }
     }
   }