'How to resolve Fatal error: Uncaught TypeError: Return value?

I have a very annoying problem to solve. I have a method that searches for a code of a sale, it is:

  public function findByCode(string $code, string $columns = "*"): ?Sales
    {
        $find = $this->find("code = :code", "code={$code}", $columns);
        return $find->fetch(true);
    }

When I try to call him that:

$sales = (new Sales())->findByCode(client()->code);

It shows me the following error:

Uncaught TypeError: Return value of Source\Models\Sales::findByCode() must be an instance of Source\Models\Sales or null, array returned in

How to solve this?

phpmysql


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