HIDE AUTHOR IN K2 ITEMS

Hi,
Each time I try to Hide "Display extended author info" in "Item view options/Author options" via K2 Edit Category or K2 Items I get a message error on the site :
Notice: Undefined property: stdClass::$author in C:......componentscom_k2viewsitemview.html.php on line 58
SITE IS OFFLINE

Thanks for your help

please try to adress this issue to k2 forum...

I did ... but it seems I'm the only one with this problem so I doubt this is a 100% K2 problem

To complete...
The message error on the site appears when I want to Hide the both "Author" & "Display extended author info" in "Item view options" & "Item view options/Author options" via K2 Edit Category or K2 Items

SOLVED