The exterior (brick) wall has a vertical crack.
It goes on the full height of the building and it's right on the middle
length of the wall.

It's not very wide but it's visible. It's been like that since I bought
the house (last year).
The house is 8 yrs old in Toronto.

I had a home inspection before buying the house and the guy said the
wall it's not structural ... don't remember the details. The crack is
not visible from inside.

Based on home inspection's report and my observations there is no
moisture or humidity on that area.

What do you think? How it should be fixed, what should be the cause ...