Admin - Configuration - E-Mail Options - Allow Guest To Tell A Friend - Catalog

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Menu: Admin - Configuration - E-Mail Options - Allow Guest To Tell A Friend - Catalog

/path/to/your/shop/includes/modules/pages/tell_a_friend/header_php.php

Line #12 : if (!$_SESSION['customer_id'] && (ALLOW_GUEST_TO_TELL_A_FRIEND == 'false')) {