Issue with form validation

Strange error on if($this->request->getMethod())
Solved it in version 4.0.4 as follow

In controller

Code:

$request = $this->request->getMethod();       
        if ($request == 'post'){
            $form_validation = $this->validate([
                'ID_ASSET' => ['label' => 'Reference', 'rules' => 'required|integer'],]);
        }
        else
        {$form_validation = $this->validate([]);}
if (!$form_validation){}
else{}

in my form

Code:

<?= $validation->listErrors('validation_site'); ?>

And in the view for the errors

Code:

<?php if (count($errors)> 0): ?>
<div class="alert alert-danger" role="alert"> 
    <?php foreach ($errors as $error) : ?>
    <p class="mb-0">
        <i class="mr-1 bx bx-edit"></i><?= esc($error) ?>
    </p>
    <?php endforeach ?>
</div>
<?php endif;?>