Fix Some errors

Fix Input-Fields (not all fixed <3 pls dome)

src/Venom/Models/User.php

@@ -29,7 +29,7 @@ class User
         if (isset($_SESSION['userID']) || $this->username !== 'GUEST') {
             // try to load user from id!
             $user = DatabaseHandler::get()->getOne("SELECT * FROM users WHERE id = :id OR username = :name AND isActive = 1", [
-                ':id' => $_SESSION['userID'],
+                ':id' => $_SESSION['userID'] ?? -1,
                 ':name' => $this->username
             ]);
             if ($user !== null) {