diff --git a/service/modules/v1/controllers/PrescripDetailController.php b/service/modules/v1/controllers/PrescripDetailController.php
index cc7a74d..dd907a8 100644
--- a/service/modules/v1/controllers/PrescripDetailController.php
+++ b/service/modules/v1/controllers/PrescripDetailController.php
@@ -69,15 +69,17 @@ class PrescripDetailController extends BaseAppController
             $query->andWhere(['p.prescription_type'=>$post['prescription_type']]);
         }
 
-        if($post['start_time']?? false&&!$post['end_time']?? false){
+        $post['start_time'] = $post['start_time']?? false;
+        $post['end_time'] = $post['end_time']?? false;
+        if($post['start_time']&&!$post['end_time']){
             $query->andWhere(['>=','p.created_at',strtotime($post['start_time'])]);
         }
 
-        if(!$post['start_time']?? false&&$post['end_time']?? false){
+        if(!$post['start_time']&&$post['end_time']){
             $query->andWhere(['<=','p.created_at',strtotime($post['end_time'])]);
         }
 
-        if($post['start_time']?? false&&$post['end_time']?? false){
+        if($post['start_time']&&$post['end_time']){
             $query->andWhere(['between','p.created_at',strtotime($post['start_time']),strtotime($post['end_time'])]);
         }