Unknow-error-t process - What is this?

Hi,
I open System Monitor and see that:

http://s32.postimg.org/3o6kp01bp/Screenshot_20160523_211513.png

Can you explain for me?
Thanks

A zombie is a process that has terminated but won’t die. It can use resources and may cause hi CPU usage. Unfortunately this is an unknown process so we don’t know which one it is.

running top may show the process usage if it is consuming CPU