The firefly perk on certain weapons causing a hard client crash is a known issue and is being investigated by Bungie. There is no timeframe for a fix. If you have a weapon that is causing this issue, avoid using it until the issue is addressed. Apologies for the inconvenience. [url=https://www.bungie.net/en/Help/Article/14232] [b]You can read further information in this Help Article.[/b][/url]