diff --git a/Application/Home/Controller/PromoteController.class.php b/Application/Home/Controller/PromoteController.class.php
index 1d3156628..8c92a6ad2 100644
--- a/Application/Home/Controller/PromoteController.class.php
+++ b/Application/Home/Controller/PromoteController.class.php
@@ -230,7 +230,7 @@ class PromoteController extends BaseController
         ->where("(type = 1 and pop_time = {$currentTime}) or (type = 2 and pop_time = {$week})")
         ->order("sort asc, id desc")
         ->select();
-        $this->assign("match_rules_id", $match_rules ? json_encode(array_column($match_rules, 'id')) : []);
+        $this->assign("match_rules_id", $match_rules ? json_encode(array_column($match_rules, 'id')) : 'null');
 
         $this->assign("user_count", $user_count);
         $this->assign("total_money", $total_money);