From cd73fe86416c57f6db68794a81881d5f1f46adee Mon Sep 17 00:00:00 2001
From: Mike Shiyan <dev@mike.pp.ua>
Date: Sun, 31 Jul 2016 02:05:04 +0300
Subject: [PATCH] Issue #2755707 by ogggg, pingwin4eg: WSOD:
 array_slice($element['#array_parents'], 0, -1); is null

---
 filefield_sources.module | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/filefield_sources.module b/filefield_sources.module
index ba2717f..5562a12 100644
--- a/filefield_sources.module
+++ b/filefield_sources.module
@@ -182,9 +182,9 @@ function filefield_sources_field_process(&$element, FormStateInterface $form_sta
       $callback = array($source['class'], 'process');
       if (is_callable($callback)) {
         $element = call_user_func_array($callback, array(
-          $element,
+          &$element,
           $form_state,
-          $complete_form,
+          &$complete_form,
         ));
       }
     }
-- 
1.9.5.msysgit.0