diff --git a/hooks/subjects.pl b/hooks/subjects.pl
index 34411d0..f02c04e 100755
--- a/hooks/subjects.pl
+++ b/hooks/subjects.pl
@@ -596,7 +596,7 @@ sub tag_tests
     $project_id = lc $project_id;
     $project_id =~ s/[^a-z0-9-_]/_/g;
 
-    my $rendu = $_[2];
+    my $rendu = $_[2] // "";
 
     my $year;
     if ($_[3])