diff --git a/booking.variety_admin.inc b/booking.variety_admin.inc
index 15d971d..0699807 100644
--- a/booking.variety_admin.inc
+++ b/booking.variety_admin.inc
@@ -572,17 +572,18 @@ function booking_varietysessions_csv_report($timeslot_id) {
     $session_ids = drupal_json_decode($member->booking_variety_ids);
     //watchdog('booking_debug', 'booking_varietysessions_csv_report person session ids: <pre>@info</pre>', array('@info' => print_r( $session_ids, true)));
 
-    //get the session id that matches our timeslot
-    $sid = $session_ids[$timeslot_id];
+    //get the session id that matches our timeslot if it exists
+    if (isset($session_ids[$timeslot_id])) {
+      $sid = $session_ids[$timeslot_id];
 
-    if (! isset($data[$sid])) {
-      $data[$sid] = array();
+      if (! isset($data[$sid])) {
+        $data[$sid] = array();
+      }
+
+      //add the spaces and put this element in the right array
+      $text = array($member->booking_firstname, $member->booking_lastname);      
+      $data[$sid][] = implode(' ', $text);
     }
-    $text = array($member->booking_firstname, $member->booking_lastname);
-
-    //add the spaces and put this element in the right array
-    $data[$sid][] = implode(' ', $text);
-
   }
   //watchdog('booking_debug', "<pre>Study Group CSV Report\n@info</pre>", array('@info' => print_r( $data_array, true)));