try this:
if((you != null) && (you.skill55==1234))

if that doesn't work, try this:
if(you != null
{
if(you.skill55==1234)
{
//code here
}
}

no that didnt work also, but that ok, I know it has to be something similar to that.

Move the "you.skill55 == 1234" into another if, like this:
Code:

---

if(you != null)
{
  if(you.skill55 == 1234)
  { }
}

---