Ticket #31097: 31097.patch

src/wp-includes/user.php

@@ -1975 +1975 @@
                 $userdata = $userdata->to_array();
         }
 
-        $ID = (int) $userdata['ID'];
+        $ID = !empty($userdata['ID']) ? absint($userdata['ID']) : 0;
 
         // First, get all of the original fields
         $user_obj = get_userdata( $ID );