Bizarre security history log

Hi,

 

I just saw a pop-up box saying  'Idle Full System Scan' completed. I don't normally bother to look, but did anyway. This was the log:

 

 

NIS_01.JPG

 

 

Checked my clock, all seems to be in order:

 

 

NIS_02.JPG

 

 

Just wondering if anyone else has a similar error in their logs.

 

Thanks