diff --git a/Kernel/Output/HTML/TicketOverview/Preview.pm b/Kernel/Output/HTML/TicketOverview/Preview.pm
index 284f9b86e0..1f630e61fc 100644
--- a/Kernel/Output/HTML/TicketOverview/Preview.pm
+++ b/Kernel/Output/HTML/TicketOverview/Preview.pm
@@ -262,6 +262,7 @@ sub Run {
 
         KEY:
         for my $Key ( keys %{$PreviewArticleSenderTypes} ) {
+            next KEY unless $PreviewArticleSenderTypes->{$Key};
 
             my $ID = $ArticleObject->ArticleSenderTypeLookup( SenderType => $Key );
             if ($ID) {