diff --git a/lcs/admin/users.ptl b/lcs/admin/users.ptl
index 070b8ba..9327524 100644
--- a/lcs/admin/users.ptl
+++ b/lcs/admin/users.ptl
@@ -21,7 +21,10 @@ class UserUI:
 
     def form(self):
         ident_methods = get_cfg('identification', {}).get('methods', [])
-        formdef = User.get_formdef()
+        if hasattr(User, 'get_formdef'):
+            formdef = User.get_formdef()
+        else:
+            formdef = None
         users_cfg = get_cfg('users', {})
 
         form = Form(enctype='multipart/form-data')
@@ -47,7 +50,10 @@ class UserUI:
         return form
 
     def submit_form(self, form):
-        formdef = User.get_formdef()
+        if hasattr(User, 'get_formdef'):
+            formdef = User.get_formdef()
+        else:
+            formdef = None
         if not self.user:
             self.user = User()
         for f in ('name', 'email', 'is_admin'):