diff --git a/application/third_party/train/controllers/search.php b/application/third_party/train/controllers/search.php
index 0e217f82..1563caa7 100644
--- a/application/third_party/train/controllers/search.php
+++ b/application/third_party/train/controllers/search.php
@@ -438,7 +438,7 @@ class search extends CI_Controller{
 	function ticket_exchange($price,$num){
 	    //echo $this->can_buy_now;
 		if($this->cache == 'yes' || $this->seveth == 'yes'){
-			if(isset($price)){
+			if(isset($price) && is_numeric($num)){
 				if($price > 0){
 					return '有';
 				}else{