Why does the error come up?

[qwerty.56]

If you put your left hand on a satin thing or your hand will remain empty
then immediately catch errors from this line

Hud.Game.Items.FirstOrDefault(item => item.Location == ItemLocation.LeftHand)  

how to fix?

[qwerty.56]

Or how else to get a percentage of the buff?

if(Hud.Game.Me.Powers.BuffIsActive(Hud.Sno.SnoPowers.KarleisPoint.Sno)){ 
if(Hud.Game.Items.FirstOrDefault(item => item.Location == ItemLocation.LeftHand).Perfections.FirstOrDefault(p => p.Attribute.Index == 1288).Modifier == Hud.Sno.SnoPowers.KarleisPoint.Sno){ 
BuffCur=Hud.Game.Items.FirstOrDefault(item => item.Location == ItemLocation.LeftHand).Perfections.FirstOrDefault(p => p.Attribute.Index == 1288).Cur; 
} 
}  

decided so

var items = Hud.Game.Items.FirstOrDefault(item => item.Location == ItemLocation.LeftHand);         
if(itemsl.Perfections.Any(p => p.Attribute.Index == 1288)){ 
if(items.Perfections.FirstOrDefault(p => p.Attribute.Index == 1288).Modifier== Hud.Sno.SnoPowers.KarleisPoint.Sno){ 
BuffCur = items.Perfections.FirstOrDefault(p => p.Attribute.Index == 1288).Cur;}}