From e848025f39ee0c708d6a1416e693c54102cf2763 Mon Sep 17 00:00:00 2001
From: plegall <plg@piwigo.org>
Date: Fri, 22 Jan 2021 12:23:09 +0100
Subject: [PATCH] fixes #1257 avoid warning on PHP 7.4

---
 admin/batch_manager.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/admin/batch_manager.php b/admin/batch_manager.php
index 4dc476e2d..171592eb5 100644
--- a/admin/batch_manager.php
+++ b/admin/batch_manager.php
@@ -346,6 +346,8 @@ SELECT id
  ;';
     $all_elements = query2array($query, null, 'id');
 
+    $linked_to_virtual = array();
+
     $query = '
  SELECT id
    FROM '.CATEGORIES_TABLE.'