diff --git a/src/Vervis/Handler/Ticket.hs b/src/Vervis/Handler/Ticket.hs
index d3f26f0..5fca42c 100644
--- a/src/Vervis/Handler/Ticket.hs
+++ b/src/Vervis/Handler/Ticket.hs
@@ -270,6 +270,7 @@ getTicketR shar proj ltkhid = do
                 requireEitherAlt
                     (do mtal <- getValBy $ UniqueTicketAuthorLocal ltid
                         for mtal $ \ tal -> do
+                            _ <- getBy404 $ UniqueTicketUnderProjectProject tplid
                             p <- getJust $ ticketAuthorLocalAuthor tal
                             getJust $ personIdent p
                     )