diff --git a/authjwt.php b/authjwt.php
index b9a851a..cbcbd1a 100644
--- a/authjwt.php
+++ b/authjwt.php
@@ -93,7 +93,8 @@ class authjwt extends auth
   public function getdetails ()
   // {{{
   {
-    if (key_exists ("email", $this->payload) &&
+    if (! is_array ($this->payload) ||
+        key_exists ("email", $this->payload) &&
         $this->payload["email"] === "anonymous")
       return array ("lastname"  => "anonymous",
                     "firstname" => "",