From 1e5b13c068bcd5926a64204d554cfce1b586c868 Mon Sep 17 00:00:00 2001
From: Vitalii Bezsheiko <vitaliybezsh@gmail.com>
Date: Wed, 14 Dec 2022 20:53:50 +0200
Subject: [PATCH] pkp/pkp-lib#8493 submission's uploaded user ID can be null

---
 classes/submissionFile/maps/Schema.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/classes/submissionFile/maps/Schema.php b/classes/submissionFile/maps/Schema.php
index cec0ef006ff..4b693611b2c 100644
--- a/classes/submissionFile/maps/Schema.php
+++ b/classes/submissionFile/maps/Schema.php
@@ -198,7 +198,8 @@ protected function mapByProperties(array $props, SubmissionFile $submissionFile)
             }
 
             if ($prop === 'uploaderUserName') {
-                $user = Repo::user()->get($submissionFile->getData('uploaderUserId'));
+                $userId = $submissionFile->getData('uploaderUserId');
+                $user = !is_null($userId) ? Repo::user()->get($userId) : null; // userId can be null, see pkp/pkp-lib#8493
                 $output[$prop] = $user?->getUsername() ?? '';
 
                 continue;