diff --git a/app/enterprise/controller/Posts.php b/app/enterprise/controller/Posts.php
index e44b3ee..3123558 100644
--- a/app/enterprise/controller/Posts.php
+++ b/app/enterprise/controller/Posts.php
@@ -273,6 +273,9 @@ class Posts extends BaseController
                 $user_type = $info['privacy'] == 2 ? 1 : 2;
                 $privacy_users = [];
                 foreach ($user_ids as $user_id) {
+                    if (!is_numeric($user_id)) {
+                        throw new \Exception(lang('system.error'));
+                    }
                     $privacy_users[] = [
                         'posts_id' => $posts_id,
                         'user_id' => $user_id,