bugfix variable out of scope

booking.studygroups.inc

@@ -786,7 +786,7 @@ function booking_studygroups_update_form($node, &$form_state, $sid) {
 			//if we didn't find an existing record, add it to the list to insert
 			if (! $found && $person->session <> 0) {
 				$message = t('Found no existing study group session for user id !id (!name). Adding to list of inserts for session !session.', 
-					array('!id' => $person->nid, '!sid' => $mapping->sid, '!session' => $person->session,
+					array('!id' => $person->nid, '!session' => $person->session,
 					'!name' => $person->booking_firstname . " " . $person->booking_lastname
 				));