From 84d96453fdabbdb22cad7182f980f8f718a847b7 Mon Sep 17 00:00:00 2001
From: andris-sevcenko <asevcenko@gmail.com>
Date: Thu, 11 Jul 2019 21:22:13 +0300
Subject: [PATCH] Fixed #4382

---
 CHANGELOG-v3.md       | 1 +
 src/fields/Assets.php | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/CHANGELOG-v3.md b/CHANGELOG-v3.md
index 4efc5b77819..dc9e6b7488b 100644
--- a/CHANGELOG-v3.md
+++ b/CHANGELOG-v3.md
@@ -17,6 +17,7 @@
 - Fixed a bug where Assets fields set to restrict uploads to a single folder could have empty selector modals. ([#4522](https://github.com/craftcms/cms/issues/4522))
 - Fixed an error that could occur if a template was accessing the deprecated `locale` property of an element query, but `siteId` wasn’t set to an integer. ([#4531](https://github.com/craftcms/cms/issues/4531))
 - Fixed a bug where users without the “Publish live changes” permission for a section weren’t able to create new entries. ([#4528](https://github.com/craftcms/cms/issues/4529))
+- Fixed a PHP error that would occur when uploading a file to an Asset field using frontend. ([#4382](https://github.com/craftcms/cms/issues/4382))
 
 ## 3.2.0 - 2019-07-09
 
diff --git a/src/fields/Assets.php b/src/fields/Assets.php
index f132ce58b4d..225fe5d8414 100644
--- a/src/fields/Assets.php
+++ b/src/fields/Assets.php
@@ -578,6 +578,10 @@ private function _getUploadedFiles(ElementInterface $element): array
         /** @var Element $element */
         $uploadedFiles = [];
 
+        if (ElementHelper::rootElement($element)->getIsRevision()) {
+            return $uploadedFiles;
+        }
+
         // Grab data strings
         if (isset($this->_uploadedDataFiles['data']) && is_array($this->_uploadedDataFiles['data'])) {
             foreach ($this->_uploadedDataFiles['data'] as $index => $dataString) {