invalid memory address or nil pointer dereference

[SummerFans]

/inspection/inspection.go

    if c.Delivery.IsMisdirected {
        s.handler.CargoWasMisdirected(c)      //<-- s.handle is nil
    }

    if c.Delivery.IsUnloadedAtDestination {
        s.handler.CargoHasArrived(c).               //<-- s.handle is nil
    }