With the help of this Block Bot IPs PrestaShop Module, customers can block the unwanted users from accessing your website. Sometimes, traffic comes from porn or bad websites. Such traffic should be blocked to avoid any penalty from the search Engines because Google considers the sites having referral traffic from such sites as spammy or low quality. First you need to find out the IPs of such spammers and then put them into the GEP IP ban plugin.
Price of this plugin is just 30EURO
More information here; Geo IP Ban - PrestaShop Addons