From 906daa9b7da15aa3bf4cc1083844cdff6b25cb38 Mon Sep 17 00:00:00 2001
From: plegall <plg@piwigo.org>
Date: Wed, 13 Nov 2024 12:31:17 +0100
Subject: [PATCH] fixes #2159 avoid calling addslashes on null value (compat
 PHP 8.x)

---
 admin/include/functions_metadata.php | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/admin/include/functions_metadata.php b/admin/include/functions_metadata.php
index 36a056d59..8f0bb5007 100644
--- a/admin/include/functions_metadata.php
+++ b/admin/include/functions_metadata.php
@@ -103,7 +103,13 @@ function get_sync_exif_data($file)
     {
       $exif[$pwg_key] = metadata_normalize_keywords_string($exif[$pwg_key]);
     }
-    
+
+    if (empty($exif[$pwg_key]))
+    {
+      unset($exif[$pwg_key]);
+      continue;
+    }
+
     $exif[$pwg_key] = addslashes($exif[$pwg_key]);
   }