- $flink = new Foreign_link();
- $flink->service = $service;
- $flink->foreign_id = $foreign_id;
- $flink->limit(1);
+ if (empty($foreign_id) || empty($service)) {
+ return null;
+ } else {
+ $flink = new Foreign_link();
+ $flink->service = $service;
+ $flink->foreign_id = $foreign_id;
+ $flink->limit(1);