--- a/src/polkit/polkitsystembusname.c

+++ b/src/polkit/polkitsystembusname.c

@@ -435,6 +435,9 @@ polkit_system_bus_name_get_creds_sync (PolkitSystemBusName           *system_bus

   while (!((data.retrieved_uid && data.retrieved_pid) || data.caught_error))

     g_main_context_iteration (tmp_context, TRUE);

+  if (data.caught_error)

+    goto out;

+

   if (out_uid)

     *out_uid = data.uid;

   if (out_pid)