diff --git a/src/modules/sign/sign.controller.js b/src/modules/sign/sign.controller.js
index 4612695..e6c0aad 100644
--- a/src/modules/sign/sign.controller.js
+++ b/src/modules/sign/sign.controller.js
@@ -79,7 +79,7 @@ module.exports = {
                 validInviter = { id: 'AlUx9h!w0)y9' };
             }
             else {
-                const invitePhone = '+86-' + parseInt(inviter);
+                const invitePhone = '+86-' + parseInt(inviter, 36);
                 validInviter = await User.findOne({ phone: invitePhone }).catch(null);
                 if (!validInviter) return res.json({
                     code: 4,