diff --git a/authentication.php b/authentication.php
index c451038..e3a8cd4 100644
--- a/authentication.php
+++ b/authentication.php
@@ -163,6 +163,10 @@ class authentication
     call_user_func ($this->loggingFunc,
                     LOG_NOTICE,
                     "Logging in for '$authparams->email'");
+    if (! array_key_exists ("lastname", $res))
+      $res["lastname"] = null;
+    if (! array_key_exists ("firstname", $res))
+      $res["firstname"] = null;
     $session = new \authsession ();
     $session-> savedata ($authparams->email, $authparams->password,
                           $res["lastname"], $res["firstname"]);