NEVER use nulled plugins on sites. They can take down all sites on the server because they contain malicious code that is used for traffic stealing, database mining (stealing data), redirecting to criminal's site(s), used to remotely attack other servers, etc. Even images contain malicious code. Everyone should install Wordfence plugin on their sites and upgrade to the subscription if you have the funds. If you can't afford to buy your own Wordpress themes and plugins, I suggest you join a group buy so you get a legitimate copy of the developer's product. NEVER use nulled plugins on your sites or you will regret it.