diff --git a/filefield_paths.inc b/filefield_paths.inc
index 5254399..c90a1d9 100644
--- a/filefield_paths.inc
+++ b/filefield_paths.inc
@@ -67,8 +67,14 @@ function filefield_paths_filefield_paths_process_file(ContentEntityInterface $en
 
   /** @var \Drupal\file\Entity\File $file */
   foreach ($field->referencedEntities() as $file) {
-    /** @var \Drupal\Core\StreamWrapper\StreamWrapperInterface $source_scheme */
+    /** @var \Drupal\Core\StreamWrapper\StreamWrapperInterface|null $source_scheme */
     $source_scheme = $stream_wrapper_manager->getViaUri($file->getFileUri());
+
+    // Protect the loop from errors related to the entity's origin.
+    if (!$source_scheme instanceof StreamWrapperInterface) {
+      continue;
+    }
+
     $source_scheme_name = key($stream_wrapper_manager->getWrappers($source_scheme->getType()));
     if (in_array($source_scheme_name, $schemas) && !empty($wrappers[$destination_scheme_name])) {
       // Process file if this is a new entity, 'Active updating' is set or