Fix possible error stack overflow in last commit.
Fix possible error stack overflow in last commit.

sunaku/wmii,bwhmather/wmii,0intro/wmii,sunaku/wmii,sunaku/wmii,bwhmather/wmii,0intro/wmii,sunaku/wmii,sunaku/wmii,bwhmather/wmii,0intro/wmii,0intro/wmii,bwhmather/wmii,bwhmather/wmii