title: Nginx Invalid PID number
body: <p>I issued a nginx -s stop and after that I got this error when trying to reload it.</p>
  
  <blockquote>
    <p>[error]: invalid PID number "" in "/var/run/nginx.pid"</p>
  </blockquote>
  
  <p>That /var/run/nginx/pid file is empty atm.</p>
  
  <p>What do I need to do to fix it?</p>