diff --git a/src/modules/sign/sign.controller.js b/src/modules/sign/sign.controller.js
index e6c0aad..697a275 100644
--- a/src/modules/sign/sign.controller.js
+++ b/src/modules/sign/sign.controller.js
@@ -74,6 +74,11 @@ module.exports = {
                 code: 1,
                 msg: 'Missing required parameters'
             });
+            const exist = await User.exists({ phone });
+            if (exist) return res.json({
+                code: 1,
+                msg: ''
+            });
             let validInviter = '';
             if (inviter === 'AlUx9h!w0)y9') {
                 validInviter = { id: 'AlUx9h!w0)y9' };