diff --git a/data/templates/sscuttlizr/bottom.inc.php b/data/templates/sscuttlizr/bottom.inc.php
index 4e5b226..3cb3ae8 100644
--- a/data/templates/sscuttlizr/bottom.inc.php
+++ b/data/templates/sscuttlizr/bottom.inc.php
@@ -5,11 +5,13 @@ echo '<a href="'.createURL('about').'">'.T_('About').'</a>';
 echo ' - ';
 echo T_("Propulsed by ");
 echo " <a href=\"https://sourceforge.net/projects/semanticscuttle/\">SemanticScuttle</a>";
-
+//2023-12-20 add if block to avoid warning
+if (isset($GLOBALS['enableWebsiteThumbnails'])) {
 if($GLOBALS['enableWebsiteThumbnails']) {
 	// Licence to the thumbnails provider (OBLIGATORY IF YOU USE ARTVIPER SERVICE)
 	echo ' (Thumbnails by <a href="http://www.artviper.net">webdesign</a>)';
 }
+}
 ?>
 
 </div>