diff --git a/data/templates/sscuttlizr/bookmarks-thumbnail.inc.tpl.php b/data/templates/sscuttlizr/bookmarks-thumbnail.inc.tpl.php
index 77cc67f..1cdffde 100644
--- a/data/templates/sscuttlizr/bookmarks-thumbnail.inc.tpl.php
+++ b/data/templates/sscuttlizr/bookmarks-thumbnail.inc.tpl.php
@@ -5,6 +5,9 @@
  *
  * Expects a $row variable with bookmark data.
  */
+//2023-12-20 add line to avoid warning
+if (!isset($GLOBALS['enableWebsiteThumbnails'])) return;
+
 if (!$GLOBALS['enableWebsiteThumbnails']) {
     return;
 }
@@ -15,4 +18,4 @@ $thumbnailHash = md5(
 //echo '<a href="'. $address .'"'. $rel .' ><img class="thumbnail" src="http://www.artviper.net/screenshots/screener.php?url='.$address.'&w=120&sdx=1280&userID='.$GLOBALS['thumbnailsUserId'].'&hash='.$thumbnailHash.'" />';
 echo '<img class="thumbnail" onclick="window.location.href=\''.htmlspecialchars($address).'\'" src="http://www.artviper.net/screenshots/screener.php?url='.htmlspecialchars($address).'&amp;w=120&amp;sdx=1280&amp;userID='.$GLOBALS['thumbnailsUserId'].'&amp;hash='.$thumbnailHash.'" />';
 
-?>
\ No newline at end of file
+?>