diff --git a/src/casdoor/user.py b/src/casdoor/user.py
index c8337e9..63dd153 100644
--- a/src/casdoor/user.py
+++ b/src/casdoor/user.py
@@ -159,6 +159,9 @@ def __init__(self):
         self.mfaPhoneEnabled = False
         self.mfaEmailEnabled = False
 
+        self.invitation = ""
+        self.invitationCode = ""
+
         self.ldap = ""
         self.properties = {}