title: Nagios: return code of 13 is out of bounds
body: <p>How can I fix that return code?</p>
  <p><a href="https://i.stack.imgur.com/PSCmz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PSCmz.png" alt="enter image description here" /></a></p>