Merge branch 'main' into issue-3911issue-3911

2 files changed, 5 insertions, 2 deletions

diff --git a/lib/classes/exportdocument/ExportDocument.interface.php b/lib/classes/exportdocument/ExportDocument.php
index 27aaee2..27aaee2 100644
--- a/lib/classes/exportdocument/ExportDocument.interface.php
+++ b/lib/classes/exportdocument/ExportDocument.php
diff --git a/lib/classes/exportdocument/ExportPDF.class.php b/lib/classes/exportdocument/ExportPDF.php
index 8645f5b..f676c45 100644
--- a/lib/classes/exportdocument/ExportPDF.class.php
+++ b/lib/classes/exportdocument/ExportPDF.php
@@ -1,7 +1,7 @@
 <?php
 # Lifter010: TODO
 /**
- * ExportPDF.class.php - create and export or save a pdf with simple HTML-Data
+ * ExportPDF.php - create and export or save a pdf with simple HTML-Data
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -115,12 +115,15 @@ class ExportPDF extends TCPDF implements ExportDocument
             // Fetch headers from url, handle possible redirects
             do {
                 $headers = get_headers($url, true, get_default_http_stream_context($url));
+                if (!$headers) {
+                    break;
+                }
                 list(, $status) = explode(' ', $headers[0]);
 
                 $url = $headers['Location'] ?? $headers['location'] ?? $url;
             } while (in_array($status, [300, 301, 302, 303, 305, 307]));
 
-            $status = $status ?: 404;
+            $status = $status ?? 404;
 
             // Replace image with link on error (and not internal), otherwise return sainitized
             // url