BuildingHelper:BuildCommand(args) failed

[SirWayN3]

The Function BuildingHelper:BuildCommand(args) failed with following line:

-- Cancel current action
if not queue then
builder:Stop()
end

since "builder" hasnt been set properly. the hero initially spawned is the builder, since no other selection has been made so far, the function fails. when i select any other entity, then the builder it works well.