diff --git a/webapp/controller/ActivityController.class.php b/webapp/controller/ActivityController.class.php
index fbb5aee..842ecfd 100644
--- a/webapp/controller/ActivityController.class.php
+++ b/webapp/controller/ActivityController.class.php
@@ -282,7 +282,7 @@ class ActivityController{
             $r -> pexpire($draw_uuid, 1000 * 3600 * 24);
         } else {
             $draw_db = json_decode($user_db_str, true);
-            if ($flush_flag = 1) {
+            if ($flush_flag == 1) {
                 $user_db_str = $r->get($draw_uuid);
                 $draw_list = $this->randomReward(1,$account_id);
                 $draw_db = json_decode($user_db_str, true);