diff --git a/src/Vervis/API.hs b/src/Vervis/API.hs
index 3496375..1304a98 100644
--- a/src/Vervis/API.hs
+++ b/src/Vervis/API.hs
@@ -689,6 +689,10 @@ createTicketC (Entity pidUser personUser) sharerUser summary audience ticket muT
                     case ebundle of
                         Left _ -> throwE "MR bundle specified as a URI"
                         Right (hBundle, bundle) -> checkBundle hBundle bundle
+                case (typ, diffs) of
+                    (PatchMediaTypeDarcs, _ :| _ : _) ->
+                        throwE "More than one Darcs patch bundle provided"
+                    _ -> return ()
                 return (branch, typ, diffs)
                 where
                 checkBranch
@@ -1477,6 +1481,10 @@ offerTicketC (Entity pidUser personUser) sharerUser summary audience ticket uTar
                         case ebundle of
                             Left _ -> throwE "MR bundle specified as a URI"
                             Right (hBundle, bundle) -> checkBundle hBundle bundle
+                    case (typ, diffs) of
+                        (PatchMediaTypeDarcs, _ :| _ : _) ->
+                            throwE "More than one Darcs patch bundle provided"
+                        _ -> return ()
                     return (branch, typ, diffs)
                     where
                     checkBranch h lu = do
diff --git a/src/Vervis/Federation/Ticket.hs b/src/Vervis/Federation/Ticket.hs
index 48f7ad4..03bd11d 100644
--- a/src/Vervis/Federation/Ticket.hs
+++ b/src/Vervis/Federation/Ticket.hs
@@ -154,6 +154,10 @@ checkOfferTicket author ticket uTarget = do
                 case ebundle of
                     Left _ -> throwE "MR bundle specified as a URI"
                     Right (hBundle, bundle) -> checkBundle hBundle bundle
+            case (typ, diffs) of
+                (PatchMediaTypeDarcs, _ :| _ : _) ->
+                    throwE "More than one Darcs patch bundle provided"
+                _ -> return ()
             return (branch, typ, diffs)
             where
             checkBranch h lu = do
@@ -611,6 +615,10 @@ checkCreateTicket author ticket muTarget = do
                 case ebundle of
                     Left _ -> throwE "MR bundle specified as a URI"
                     Right (hBundle, bundle) -> checkBundle hBundle bundle
+            case (typ, patches) of
+                (PatchMediaTypeDarcs, _ :| _ : _) ->
+                    throwE "More than one Darcs patch bundle provided"
+                _ -> return ()
             return (branch, typ, patches)
             where
             checkBranch