1 files changed, 1 insertions, 1 deletions
diff --git a/CGI.pl b/CGI.pl
index 163c83a56..c1a9259bd 100644
--- a/CGI.pl
+++ b/CGI.pl
@@ -173,7 +173,7 @@ sub ValidateBugID {
     FetchOneColumn()
       || ThrowUserError("invalid_bug_id_non_existent", {'bug_id' => $id});
 
-    return if ($field eq "dependson" || $field eq "blocked");
+    return if (defined $field && ($field eq "dependson" || $field eq "blocked"));
     
     return if Bugzilla->user->can_see_bug($id);