Call to a member function hasErrors() on null?

Question

Yii

Good afternoon, I'm trying to make a button where, when clicked, a form opens. But an error occurs:

Call to a member function hasErrors() on null

Requires:

if ($this->model->hasErrors($attributeName)) {
            Html::addCssClass($options, $this->form->errorCssClass);
        }

controller

public function actionInsert() {
        $time = new Feedback();

        if ($time->load(Yii::$app->request->post())) {
            if ($time->insert()) {
                return $this->redirect(['page/index']);
            }
            Yii::$app->session->setFlash(
                'success',
                false
            );
        }
        return $this->render('insert', ['time' => $time]);
    }