The buggy release of Assassin's Creed: Unity was to blame for the disappointing launch of Assassin's Creed Syndicate, says Ubisoft CFO Alain Martinez.

In Ubisoft's recent sales and earnings call, Martinez said that "Clearly in the first week [Syndicate] was impacted by what had happened with Unity."

Syndicate launched October 23 and sold poorly in launch week compared to its predecessor, which infamously launched with serious performance issues and glitches.

In its second week, however, strong word-of-mouth and good reviews appear to have buoyed sales, outperforming Unity's second week.

Martinez hopes that Syndicate will follow the same trend as Assassin's Creed: Black Flag, which initially underperformed after the previous entry, Assassin's Creed III, was met with negative response, but later lifted.

"Black Flag was 50 percent below Assassin's Creed III in its first week. At the end of the year it was close to III, and after two years it was way above III," said Martinez.

Assassin's Creed Syndicate is out now for new-gen consoles and PC.