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Hi.

For Prestashop 1.7

./classes/checkout/CheckoutAddressesStep.php

1. find function handleRequest

2. almost finally add functions

$this->logged_in = $this
            ->getCheckoutProcess()
            ->getCheckoutSession()
            ->customerHasLoggedIn();

if ($this->logged_in && !$this->getCheckoutSession()->getCustomer()->is_guest) {
            $this->setComplete(true);
}

3. result: