that line of code is from pirvu's perfect ai, but you're maybe new to 3dgs so pirvu is the one who's writing aum magazine and in aum 27-31 i think he was creating workshop perfect ai, about node based pathfinding, and that line is not working for me for some time.

i also had problems with this kind of code: if(key_w || key_s || key_a || key_d), that line didnt work also without more brackets