hi, I have kind of a problem in the Act II lich cave:

I killed all the non-master lichs and collected 3 small evil statues. Now there is one locked door in the southern part that I can't get through.

In front of it is a 4th small statue which I can't pick up (the name appears if I press ALT though, but even when clicking the text I can't pick it up.)

Is this supposed to be like this?