求助。谁能帮我去cnode发个贴反应下注册bug

昨天下午想注册，在github授权之后点注册新帐号会出现如下错误信息。我给他们发了邮件到现在还没回啊= =。。

MongoError: E11000 duplicate key error index: b2urh52bh95t.users.$email_1 dup key: { : null }
at Db.wrap (/home/www/git/cnode/node_modules/mongoose/node_modules/mongodb/lib/mongodb/db.js:1875:11)
at null.<anonymous> (/home/www/git/cnode/node_modules/mongoose/node_modules/mongodb/lib/mongodb/collection.js:320:26)
at g (events.js:180:16)
at EventEmitter.emit (events.js:106:17)
at Db._callHandler (/home/www/git/cnode/node_modules/mongoose/node_modules/mongodb/lib/mongodb/db.js:1413:25)
at /home/www/git/cnode/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:421:30
at MongoReply.parseBody (/home/www/git/cnode/node_modules/mongoose/node_modules/mongodb/lib/mongodb/responses/mongo_reply.js:127:5)
at null.<anonymous> (/home/www/git/cnode/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:379:22)
at EventEmitter.emit (events.js:95:17)
at null.<anonymous> (/home/www/git/cnode/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/connection_pool.js:136:13)