无法在真实浏览器上重现phpbrowser错误

I'm running into some trouble writing a simple test using codeception.

It's a simple procedure to upload a excel file and check if the data on the excel file is available on the database after uploade. My test code:

public function do_carga_vendedores(BTester $I)
    {
        $I->amOnPage('/admin/carga/vendedores');
        $I->attachFile('templateupload', 'carga_vendedores.xlsx');
        $I->click('Enviar');
        $I->see('Cadastro feito com sucesso!');
        $I->seeInDatabase('usuario', [
                'cpf' => '332.895.032-08',
                'nome' => 'Test1'
            ]);

        $I->seeInDatabase('usuario', [
                'cpf' => '776.676.558-63',
                'nome' => 'Test2'
            ]);
    }
}

Generates:

Step  I see "Cadastro feito com sucesso!"
Fail  Failed asserting that   /admin/carga/doRealizarCargaVendedor

When I check the output file it shows:

Fatal error: Call to a member function getType() on a non-object in /var/www/apps/shared/models/BaseModel.php on line 82

Line 82 code:

switch ($message->getType()) {

I've done a var_dump on the $message variable and the result is:

object(Phalcon\Mvc\Model\Message)[148]
  protected '_type' => string 'PresenceOf' (length=10)
  protected '_message' => string 'nome is required' (length=16)
  protected '_field' => string 'nome' (length=4)
  protected '_model' => null

The whole code for BaseModel.php can be found here

But if I upload the file using chrome, the issue isn't reproducible. I don't know if this is as phpbrowser problem or if there is a defect on my code.

OBS: Framework: Phalcon 2.0.5 / Codeception 2.1.1