diff --git a/booking.travel.inc b/booking.travel.inc
index 91dfa86..4d248a7 100644
--- a/booking.travel.inc
+++ b/booking.travel.inc
@@ -121,7 +121,7 @@ function travel_form($node, &$form_state, $db_node = NULL, $inserting = FALSE, $
   }
   
   //get info from the database if we don't have it
-  if (! $data->booking_partner_id) {
+  if (! isset($data->booking_partner_id)) {
     watchdog('booking_debug', "<pre>Travel form querying database for missing details</pre>");
 
     $person = db_query("SELECT booking_dietary, booking_medical_conditions, booking_bf_gf_nid, booking_partner_id, booking_room_mate1 " .