php error on takepos admin

Author: defrance

htdocs/takepos/receipt.php

@@ -79,7 +79,7 @@
 
 top_htmlhead('', '', 1);
 
-if ((string) $place != '') {
+if ((string) $place != '' && !empty($_SESSION["takeposterminal"])) {
 	$sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."facture";
 	$sql .= " WHERE ref = '(PROV-POS".$db->escape($_SESSION["takeposterminal"]."-".$place).")'";
 	$sql .= " AND entity IN (".getEntity('invoice').")";